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PDF W78E065A Data sheet ( Hoja de datos )
| Número de pieza | W78E065A | |
| Descripción | 8-BIT MICROCONTROLLER | |
| Fabricantes | Winbond | |
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W78E65/W78E065A Data Sheet
8-BIT MICROCONTROLLER
Table of Contents-
1. GENERAL DESCRIPTION ......................................................................................................... 3
2. FEATURES ................................................................................................................................. 3
3. PIN CONFIGURATIONS ............................................................................................................ 4
4. PIN DESCRIPTION..................................................................................................................... 5
5. BLOCK DIAGRAM ...................................................................................................................... 6
6. FUNCTIONAL DESCRIPTION ................................................................................................... 7
6.1 RAM ................................................................................................................................ 7
6.2 Timers 0, 1, and 2........................................................................................................... 8
6.2.1 Timer 2 Output .................................................................................................................8
6.3 Clock ............................................................................................................................... 8
6.3.1 Crystal Oscillator ..............................................................................................................8
6.3.2 External Clock ..................................................................................................................8
6.4 Power Management........................................................................................................ 8
6.4.1 Idle Mode..........................................................................................................................8
6.4.2 Power-down Mode............................................................................................................9
6.4.3 Reduce EMI Emission ......................................................................................................9
6.5 Reset............................................................................................................................... 9
6.5.1 W78E65 Special Function Registers (SFRs) and Reset Values.....................................10
6.6 Port 4 ............................................................................................................................ 11
6.6.1 Port Options Register .....................................................................................................11
6.6.2 INT2 / INT3 ..................................................................................................................11
6.6.3 Port 4 Base Address Registers ......................................................................................13
6.7 Pulse Width Modulated Outputs (PWM)....................................................................... 15
6.8 Watchdog Timer ........................................................................................................... 18
6.9 In-System Programming (ISP) Mode............................................................................ 20
6.9.1 In-System Programming Control Register (CHPCON) ...................................................21
6.10 Software Reset ............................................................................................................. 22
6.11 H/W Reboot Mode (Boot from LD FLASH EPROM) .................................................... 22
6.12 Security ......................................................................................................................... 25
7. ELETRICAL CHARACTERISTICS ........................................................................................... 26
7.1 Absolute Maximum Ratings .......................................................................................... 26
7.2 DC Characteristics........................................................................................................ 26
7.3 AC Characteristics ........................................................................................................ 28
8. TIMING WAVEFORMS ............................................................................................................. 29
Publication Release Date: January 9, 2006
- 1 - Revision A7
1 page  
W78E65/W78E065A
4. PIN DESCRIPTION
SYMBOL
EA
TYPE
DESCRIPTIONS
EXTERNAL ACCESS ENABLE: This pin forces the processor to execute the
I external ROM. The ROM address and data will not be presented on the bus if
the EA pin is high.
PSEN
ALE
RST
XTAL1
XTAL2
VSS
VDD
P0.0−P0.7
P1.0−P1.7
P2.0−P2.7
P3.0−P3.7
P4.0−P4.3
OH
PROGRAM STORE ENABLE: PSEN enables the external ROM data in the
Port 0 address/data bus. When internal ROM access is performed, no PSEN
strobe signal outputs originate from this pin.
ADDRESS LATCH ENABLE: ALE is used to enable the address latch that
O H separates the address from the data on Port 0. ALE runs at 1/6th of the
oscillator frequency.
IL
RESET: A high on this pin for two machine cycles while the oscillator is
running resets the device.
I
CRYSTAL 1: This is the crystal oscillator input. This pin may be driven by an
external clock.
O CRYSTAL 2: This is the crystal oscillator output. It is the inversion of XTAL1.
I GROUND: ground potential.
I POWER SUPPLY: Supply voltage for operation.
PORT 0: Function is the same as that of standard 8052. This port also
I/O D provides a multiplexed low order address/data bus during accesses to
external memory. Port 0 has internal pull-up resisters enabled by software.
I/O H PORT 1: Function is the same as that of standard 8052.
I/O H
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. The P2.6
and P2.7 also provide the alternate function REBOOT which is H/W reboot
from LD flash.
I/O H PORT 3: Function is the same as that of the standard 8052.
PORT 4: A bi-directional I/O. The P4.3 also provide the alternate function
I/O H REBOOT which is H/W reboot from LD flash.
* Note: TYPE I: input, O: output, I/O: bi-directional, H: pull-high, L: pull-low, D: open drain
Publication Release Date: January 9, 2006
- 5 - Revision A7
5 Page 
W78E65/W78E065A
6.6 Port 4
Port 4, address D8H, is a 8-bit multipurpose programmable I/O port. Each bit can be configured
individually by software. The Port 4 has four different operation modes.
Mode 0: P4.0−P4.3 is a bi-directional I/O port which is same as port 1. P4.2 and P4.3 also serve as
external interrupt INT3 and INT2 if enabled.
Mode 1: P4.0−P4.3 are read strobe signals that are synchronized with RD signal at specified
addresses. These signals can be used as chip-select signals for external peripherals.
Mode 2: P4.0−P4.3 are write strobe signals that are synchronized with WR signal at specified
addresses. These signals can be used as chip-select signals for external peripherals.
Mode 3: P4.0−P4.3 are read/write strobe signals that are synchronized with RD or WR signal at
specified addresses. These signals can be used as chip-select signals for external
peripherals.
When Port 4 is configured with the feature of chip-select signals, the chip-select signal address range
depends on the contents of the SFR P4xAH, P4xAL, P4CONA and P4CONB. The registers P4xAH
and P4xAL contain the 16-bit base address of P4.x. The registers P4CONA and P4CONB contain the
control bits to configure the Port 4 operation mode.
6.6.1 Port Options Register
Bit: 7 6 5 4 3 2 1 0
- - - - - - - P0UP
Mnemonic: POR
Address: 86H
P0UP: Enable Port 0 weak up. The pins of Port 0 can be configured with either the open drain or
standard port with internal pull-up. By the default, Port 0 is an open drain bi-directional I/O port. When
the P0UP bit in the POR register is set, the pins of port 0 will perform a bi-directional I/O port with
internal pull-up that is structurally the same Port2.
6.6.2 INT2 / INT3
Two additional external interrupts, INT2 and INT3 , whose functions are similar to those of external
interrupt 0 and 1 in the standard 80C52. The functions/status of these interrupts are
determined/shown by the bits in the XICON (External Interrupt Control) register. The XICON register is
bit-addressable but is not a standard register in the standard 80C52. Its address is at 0C0H. To
set/clear bits in the XICON register, one can use the "SETB ( CLR ) bit" instruction. For example,
"SETB 0C2H" sets the EX2 bit of XICON.
XICON - external interrupt control (C0H)
PX3 EX3 IE3 IT3 PX2 EX2 IE2 IT2
PX3: External interrupt 3 priority high if set
EX3: External interrupt 3 enable if set
IE3: If IT3 = 1, IE3 is set/cleared automatically by hardware when interrupt is detected/serviced
- 11 -
Publication Release Date: January 9, 2006
Revision A7
11 Page | ||
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