參數(shù)資料
型號(hào): W78ERD2A40PL
廠商: WINBOND ELECTRONICS CORP
元件分類(lèi): 微控制器/微處理器
英文描述: 8-BIT MICROCONTROLLER
中文描述: 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQCC44
封裝: ROHS COMPLIANT, PLASTIC, LCC-44
文件頁(yè)數(shù): 30/76頁(yè)
文件大?。?/td> 650K
代理商: W78ERD2A40PL
W78ERD2/W78ERD2A
- 30 -
7. PORT 4 AND BASE ADDRESS REGISTERS
Port 4, address E8H, is a 4-bit, multi-purpose, programmable I/O port. Each bit can be configured
individually, and registers P4CONA and P4CONB contain the control bits that select the mode of each
pin. Each pin has four operating modes.
Mode 0: Bi-directional I/O port, like port 1. P4.2 and P4.3 serve as external interrupts
INT3
and
INT2
,
if enabled.
Mode 1: Read-strobe signals synchronized with the
RD
signal at specified addresses. These signals
can be used as chip-select signals for external peripherals.
Mode 2: Write-strobe signals synchronized with the
WR
signal at specified addresses. These signals
can be used as chip-select signals for external peripherals.
Mode 3: Read/write-strobe signals synchronized with the
RD
or
WR
signal at specified addresses.
These signals can be used as chip-select signals for external peripherals.
In modes 1 – 3, the address range for chip-select signals depends on the contents of registers P4xAH
and P4xAL, which contain the high-order byte and low-order byte, respectively, of the 16-bit address
comparator for P4.x. This is illustrated in the following schematic.
ADDRESS BUS
Bit Length
Selectable
comparator
REGISTER
P4xAL
P4xAH
EQUAL
P4.x
MUX 4->1
WR_CS
P4 REGISTER
P4.x
READ
WRITE
DATA I/O
RD_CS
RD/WR_CS
P4xCMP1
P4xFUN0
P4xFUN1
P4xCSINV
P4.x INPUT DATA BUS
P4xCMP0
PIN
Figure 7-1
For example, the following program sets up P4.0 as a write-strobe signal for I/O port addresses 1234H
1237H with positive polarity, while P4.1
P4.3 are used as general I/O ports.
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