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부품번호 D80C51 기능
기능 CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
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D80C51 데이터시트, 핀배열, 회로
87C51 80C51BH 80C31BH
CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
Commercial Express
87C51 80C51BH 80C51BHP 80C31BH
See Table 1 for Proliferation Options
Y High Performance CHMOS EPROM
Y 24 MHz Operation
Y Improved Quick-Pulse Programming
Algorithm
Y 3-Level Program Memory Lock
Y Boolean Processor
Y 128-Byte Data RAM
Y 32 Programmable I O Lines
Y Two 16-Bit Timer Counters
Y Extended Temperature Range
(b40 C to a85 C)
Y 5 Interrupt Sources
Y Programmable Serial Port
Y TTL- and CMOS-Compatible Logic
Levels
Y 64K External Program Memory Space
Y 64K External Data Memory Space
Y ONCE Mode Facilitates System Testing
Y Power Control Modes
Idle
Power Down
MEMORY ORGANIZATION
PROGRAM MEMORY Up to 4 Kbytes of the program memory can reside on-chip (except 80C31BH) In
addition the device can address up to 64K of program memory external to the chip
DATA MEMORY This microcontroller has a 128 x 8 on-chip RAM In addition it can address up to 64 Kbytes of
external data memory
The Intel 87C51 80C51BH 80C31BH is a single-chip control-oriented microcontroller which is fabricated on
Intel’s reliable CHMOS III-E technology Being a member of the MCS 51 controller family the
87C51 80C51BH 80C31BH uses the same powerful instruction set has the same architecture and is pin-for-
pin compatible with the existing MCS 51 controller family of products
The 80C51BHP is identical to the 80C51BH When ordering the 80C51BHP customers must submit the 64
byte encryption table together with the ROM code Lock bit 1 will be set to enable the internal ROM code
protection and at the same time allows code verification
The extremely low operating power along with the two reduced power modes Idle and Power Down make
this part very suitable for low power applications The Idle mode freezes the CPU while allowing the RAM
timer counters serial port and interrupt system to continue functioning The Power Down mode saves the
RAM contents but freezes the oscillator causing all other chip functions to be inoperative
For the remainder of this document the 87C51 80C51BH and 80C31BH will be referred to as the 87C51 BH
unless information applies to a specific device
Other brands and names are the property of their respective owners
Information in this document is provided in connection with Intel products Intel assumes no liability whatsoever including infringement of any patent or
copyright for sale and use of Intel products except as provided in Intel’s Terms and Conditions of Sale for such products Intel retains the right to make
changes to these specifications at any time without notice Microcomputer Products may have minor variations to this specification known as errata
COPYRIGHT INTEL CORPORATION 1995
October 1995
Order Number 272335-003




D80C51 pdf, 반도체, 판매, 대치품
87C51 80C51BH 80C31BH
PIN DESCRIPTION
VCC Supply voltage during normal Idle and Power
Down operations
VSS Circuit ground
Port 0 Port 0 is an 8-bit open drain bidirectional I O
port As an output port each pin can sink several LS
TTL inputs Port 0 pins that have 1’s written to them
float and in that state can be used as high-imped-
ance inputs
Port 0 is also the multiplexed low-order address and
data bus during accesses to external memory In this
application it uses strong internal pullups when emit-
ting 1’s
Port 0 also receives the code bytes during EPROM
programming and outputs the code bytes during
program verification External pullups are required
during program verification
Port 1 Port 1 is an 8-bit bidirectional I O port with
internal pullups The Port 1 output buffers can drive
LS TTL inputs Port 1 pins that have 1’s written to
them are pulled high by the internal pullups and in
that state can be used as inputs As inputs Port 1
pins that are externally pulled low will source current
(IIL on the data sheet) because of the internal pull-
ups
Port 1 also receives the low-order address bytes
during EPROM programming and program verifica-
tion
Port 2 Port 2 is an 8-bit bidirectional I O port with
internal pullups Port 2 pins that have 1’s written to
them are pulled high by the internal pullups and in
that state can be used as inputs As inputs Port 2
pins that are externally pulled low will source current
(IIL on the data sheet) because of the internal pull-
ups
Port 2 emits the high-order address byte during
fetches from external Program memory and during
accesses to external Data Memory that use 16-bit
address (MOVX DPTR) In this application it uses
strong internal pullups when emitting 1’s
During accesses to external Data Memory that use
8-bit addresses (MOVX Ri) Port 2 emits the con-
tents of the P2 Special Function Register
Port 2 also receives some control signals and the
high-order address bits during EPROM programming
and program verification
Port 3 Port 3 is an 8-bit bidirectional I O port with
internal pullups The Port 3 output buffers can drive
LS TTL inputs Port 3 pins that have 1’s written to
them are pulled high by the internal pullups and in
that state can be used as inputs As inputs Port 3
pins that are externally pulled low will source current
(IIL on the data sheet) because of the pullups
Port 3 also serves the functions of various special
features of the MCS-51 Family as listed below
Pin Name
Alternate Function
P3 0
P3 1
P3 2
P3 3
P3 4
P3 5
P3 6
P3 7
RXD
TXD
INT0
INT1
T0
T1
WR
RD
Serial input line
Serial output line
External Interrupt 0
External Interrupt 1
Timer 0 external input
Timer 1 external input
External Data Memory Write strobe
External Data Memory Read strobe
Port 3 also receives some control signals for
EPROM programming and program verification
RST Reset input A high on this pin for two machine
cycles while the oscillator is running resets the de-
vice The port pins will be driven to their reset condi-
tion when a minimum VIH1 voltage is applied wheth-
er the oscillator is running or not An internal pull-
down resistor permits a power-on reset with only a
capacitor connected to VCC
ALE PROG Address Latch Enable output signal for
latching the low byte of the address during accesses
to external memory This pin is also the program
pulse input (PROG) during EPROM programming for
the 87C51
If desired ALE operation can be disabled by setting
bit 0 of SFR location 8EH With this bit set the pin is
weakly pulled high However the ALE disable fea-
ture will be suspended during a MOVX or MOVC in-
struction idle mode power down mode and ICE
mode The ALE disable feature will be terminated by
reset When the ALE disable feature is suspended or
terminated the ALE pin will no longer be pulled up
weakly Setting the ALE-disable bit has no effect if
the microcontroller is in external execution mode
4

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D80C51 전자부품, 판매, 대치품
87C51 80C51BH 80C31BH
ONCE MODE
The ONCE (‘‘On-Circuit Emulation’’) mode facilitates
testing and debugging of systems using the
87C51 BH without the 87C51 BH having to be re-
moved from the circuit The ONCE mode is invoked
by
1 Pull ALE low while the device is in reset and
PSEN is high
2 Hold ALE low as RST is deactivated
While the device is in ONCE mode the Port 0 pins
float and the other port pins and ALE and PSEN are
weakly pulled high The oscillator circuit remains ac-
tive While the 87C51 BH is in this mode an emula-
tor or test CPU can be used to drive the circuit Nor-
mal operation is restored when a normal reset is ap-
plied
87C51 BH EXPRESS
The Intel EXPRESS system offers enhancements to
the operational specifications of the MCS-51 family
of microcontrollers These EXPRESS products are
designed to meet the needs of those applications
whose operating requirements exceed commercial
temperature
The EXPRESS program includes the commercial
standard temperature range with burn-in and an ex-
tended temperature range with or without burn-in
With the commercial standard temperature range
operational characteristics are guaranteed over the
temperature range of 0 C to 70 C With the extend-
ed temperature range option operational character-
istics are guaranteed over the range of b40 C to
a85 C
The optional burn-in is dynamic for a minimum time
of 160 hours at 125 C with VCC e 6 9V g0 25V
following guidelines in MIL-STD-883 Method 1015
Package types and EXPRESS versions are identified
by a one- or two-letter prefix to the part number The
prefixes are listed in Table 3
For the extended temperature range option this
data sheet specifies the parameters which deviate
from their commercial temperature range limits
Table 3 Prefix Identification
Prefix
Package
Type
Temperature
Range
Burn-in
P
Plastic
Commercial
No
D
Cerdip
Commercial
No
N
PLCC
Commercial
No
S
QFP
Commercial
No
TP Plastic Extended
No
TD Cerdip
Extended
No
TN PLCC
Extended
No
TS QFP
Extended
No
LP Plastic Extended
Yes
LD Cerdip
Extended
Yes
LN PLCC
Extended
Yes
NOTE
Contact distributor or local sales office to match EXPRESS
prefix to proper device
Examples
P87C51 indicates 87C51 in a plastic package and
specified for commercial temperature range without
burn-in
LD87C51 indicates 87C51 in a cerdip package and
specified for extended temperature range with burn-
in
7

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CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

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