参数资料
型号: mPD789322
厂商: NEC Corp.
元件分类: 8位微控制器
英文描述: 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
中文描述: 8位微控制器与2/4/8K字节在系统可编程闪存
文件页数: 15/96页
文件大小: 482K
代理商: MPD789322
Preliminary Product Information U14673EJ1V0PM00
22
PD789322,789324,789326,789327
5.1.2 Port configuration
The ports consist of the following hardware.
Table 5-2. Port Configuration
Item
Configuration
Control registers
Port mode registers (PMm: m = 0 to 2, 4, 6, 8)
Pull-up resistor option registers (PU0, PUB2)
Port function register 8 (PF8)
Ports
Total: 21 (CMOS I/O: 21)
Pull-up resistors
Total: 13 (software control: 13)
Figure 5-2. Basic Configuration of CMOS Port
WRPUm
PU
×
WRPORTm
WRPMm
Output latch
Pmn
PMmn
VDD
P-ch
Pmn
Internal
bus
Selector
Caution Figure 5-2 shows the basic configuration of a CMOS I/O port.
This configuration differs
depending on the functions of alternate function pins. Also, an on-chip pull-up resistor can be
connected to port 4 by means of a setting in key return mode register 00 (KRM00).
Remark PU
×:
Pull-up resistor option register (
× = 0, B2)
PMmn: Bit n of port mode register m (m = 0 to 2, 4, 6, 8 n = 0 to 5)
Pmn:
Bit n of port m
RD:
Port read signal
WR:
Port write signal
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