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W77L058A 데이터시트 PDF : 부품 기능 및 핀배열

부품번호 W77L058A
기능 8-BIT MICROCONTROLLER
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W77L058A 데이터시트 및 W77L058A PDF

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W77L058A pdf, 반도체, 판매, 대치품
W77LE58/W77L058A
4. PIN DESCRIPTION
SYMBOL
EA
TYPE
DESCRIPTIONS
EXTERNAL ACCESS ENABLE: This pin forces the processor to execute out of
external ROM. It should be kept high to access internal ROM. The ROM address
I
and data will not be present on the bus if EA pin is high and the program
counter is within 32 KB area. Otherwise they will be present on the bus.
PSEN
O
ALE O
RST
I
XTAL1
I
XTAL2
VSS
VDD
O
I
I
P0.0P0.7 I/O
P1.0P1.7 I/O
P2.0P2.7 I/O
P3.0P3.7 I/O
P4.0P4.3 I/O
PROGRAM STORE ENABLE: PSEN enables the external ROM data onto the
Port 0 address/data bus during fetch and MOVC operations. When internal ROM
access is performed, no PSEN strobe signal outputs from this pin.
ADDRESS LATCH ENABLE: ALE is used to enable the address latch that
separates the address from the data on Port 0.
RESET: A high on this pin for two machine cycles while the oscillator is running
resets the device.
CRYSTAL1: This is the crystal oscillator input. This pin may be driven by an
external clock.
CRYSTAL2: This is the crystal oscillator output. It is the inversion of XTAL1.
GROUND: Ground potential
POWER SUPPLY: Supply voltage for operation.
PORT 0: Port 0 is an open-drain bi-directional I/O port. This port also provides a
multiplexed low order address/data bus during accesses to external memory.
PORT 1: Port 1 is a bi-directional I/O port with internal pull-ups. The bits have
alternate functions which are described below:
T2(P1.0): Timer/Counter 2 external count input
T2EX(P1.1) : Timer/Counter 2 Reload/Capture/Direction control
RXD1(P1.2) : Serial port 2 RXD
TXD1(P1.3) : Serial port 2 TXD
INT2(P1.4) : External Interrupt 2
INT3 (P1.5) : External Interrupt 3
INT4(P1.6) : External Interrupt 4
INT5 (P1.7) : External Interrupt 5
PORT 2: Port 2 is a bi-directional I/O port with internal pull-ups. This port also
provides the upper address bits for accesses to external memory.
PORT 3: Port 3 is a bi-directional I/O port with internal pull-ups. All bits have
alternate functions, which are described below:
RXD(P3.0) : Serial Port 0 input
TXD(P3.1) : Serial Port 0 output
INT0 (P3.2) : External Interrupt 0
INT1(P3.3) : External Interrupt 1
T0 (P3.4) : Timer 0 External Input
T1 (P3.5) : Timer 1 External Input
WR (P3.6) : External Data Memory Write Strobe
RD (P3.7) : External Data Memory Read Strobe
PORT 4: Port 4 is a 4-bit bi-directional I/O port. The P4.0 also provides the
alternate function WAIT which is the wait state control signal.
* Note: TYPE I: input, O: output, I/O: bi-directional.
-4-

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W77L058A 전자부품, 판매, 대치품
W77LE58/W77L058A
6. MEMORY ORGANIZATION
The W77L058 separates the memory into two separate sections, the Program Memory and the Data
Memory. The Program Memory is used to store the instruction op-codes, while the Data Memory is used
to store data or for memory mapped devices.
Program Memory
The Program Memory on the W77L058 can be up to 64 Kbytes long. There is also on-chip ROM which
can be used similarly to that of the 8052, except that the ROM size is 32 Kbytes. All instructions are
fetched for execution from this memory area. The MOVC instruction can also access this memory
region. Exceeding the maximum address of on-chip ROM will access the external memory.
Data Memory
The W77L058 can access up to 64Kbytes of external Data Memory. This memory region is accessed by
the MOVX instructions. Unlike the 8051 derivatives, the W77L058 contains on-chip 1K bytes MOVX
SRAM of Data Memory, which can only be accessed by MOVX instructions. These 1K bytes of SRAM
are between address 0000H and 03FFH. Access to the on-chip MOVX SRAM is optional under software
control. When enabled by software, any MOVX instruction that uses this area will go to the on-chip RAM.
MOVX addresses greater than 03FFH automatically go to external memory through Port 0 and 2. When
disabled, the 1KB memory area is transparent to the system memory map. Any MOVX directed to the
space between 0000H and FFFFH goes to the expanded bus on Port 0 and 2. This is the default
condition. In addition, the W77L058 has the standard 256 bytes of on-chip Scratchpad RAM. This can be
accessed either by direct addressing or by indirect addressing. There are also some Special Function
Registers (SFRs), which can only be accessed by direct addressing. Since the Scratchpad RAM is only
256 bytes, it can be used only when data contents are small. In the event that larger data contents are
present, two selections can be used. One is on-chip MOVX SRAM , the other is the external Data
Memory. The on-chip MOVX SRAM can only be accessed by a MOVX instruction, the same as that for
external Data Memory. However, the on-chip RAM has the fastest access times.
FFh
80h
7Fh
00h
Indirect
Addressing
RAM
Direct &
Indirect
Addressing
RAM
SFRs
Direct
Addressing
FFFFh
64 K
Bytes
External
Data
Memory
03FFh
0000h
1K Bytes
On-chip SRAM
0000h
Figure 1. Memory Map
FFFFh
External
Program
Memory
7FFFh
0000h
32K Bytes
On-chip
Program
Memory
Publication Release Date: April 17, 20067
- 7 - Revision A7

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부품번호상세설명 및 기능제조사
W77L058A

The functions of this components is a 8-BIT MICROCONTROLLER.

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