W77E468 查看數據表（PDF） - Winbond

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W77E468

8 BIT MICROCONTROLLER

Winbond 

Preliminary W77E468

Pin Description, continued

SYMBOL TYPE

DESCRIPTIONS

P3.0−P3.7 I/O 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

P3.6 : General purpose I/O

P3.7 : General purpose I/O

P4.0−P4.7 I/O PORT 4: functions as a 8-bit bi-directional I/O port but not bit-addressable.

P5.0−P5.7 I/O PORT 5: functions as a 8-bit bi-directional I/O port but not bit-addressable.

P6.0−P6.3

I/O PORT 6: functions as a 4-bit bi-directional I/O port but not bit-addressable. The

P6.0 also provides the alternate function WAIT which is the wait state control

signal.

RD

O READ STROBE: indicates external data memory read strobe.

WR

O WRITE STROBE: indicates external data memory write strobe.

* Note: TYPE I: input, O: output, I/O: bi-directional.

FUNCTIONAL DESCRIPTION

The W77E468 is 8052 pin compatible and instruction set compatible. It includes the resources of the

standard 8052 such as four 8-bit I/O Ports, three 16-bit timer/counters, full duplex serial port and

interrupt sources with two priority levels.

The W77E468 features a faster running and better performance 8-bit CPU with a redesigned core

processor without wasted clock and memory cycles. it improves the performance not just by running

at high frequency but also by reducing the machine cycle duration from the standard 8052 period of

twelve clocks to four clock cycles for the majority of instructions. This improves performance by an

average of 1.5 to 3 times. The W77E468 also provides dual Data Pointers (DPTRs) to speed up block

data memory transfers. It can also adjust the duration of the MOVX instruction (access to off-chip

data memory) between two machine cycles and nine machine cycles. This flexibility allows the

W77E468 to work efficiently with both fast and slow RAMs and peripheral devices. In addition, the

W77E468 contains on-chip 1KB MOVX SRAM, the address of which is between 0000H and 03FFH. It

only can be accessed by MOVX instruction; this on-chip SRAM is optional under software control.

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