参数资料
型号: m789436
厂商: NEC Corp.
元件分类: 8位微控制器
英文描述: 8-Bit Single-Chip Microcontrollers
中文描述: 8位单芯片微控制器
文件页数: 124/144页
文件大小: 1378K
代理商: M789436
CHAPTER 4 PORT FUNCTIONS
80
User’s Manual U15075EJ1V0UM00
Table 4-1. Port Functions (2/2)
Pin Name
I/O
Function
After Reset
Alternate Function
P80, P81
Note
I/O
Port 8.
2-bit I/O port.
Input/output can be specified in 1-bit units.
When used as an input port, an on-chip pull-up resistor
can be specified by means of pull-up resistor option
register B8 (PUB8).
Input
P90 to P97
Note
I/O
Port 9.
8-bit I/O port.
Input/output can be specified in 1-bit units.
When used as an input port, an on-chip pull-up resistor
can be specified by means of pull-up resistor option
register B9 (PUB9).
Input
Note
PD789426, 789436 Subseries only
4.2 Port Configuration
Ports have the following hardware configuration.
Table 4-2. Configuration of Port
Item
Configuration
Control registers
Port mode register (PMm: m = 0 to 3, 5, 7 to 9)
Pull-up resistor option register (PU0, PUB2, PUB3, PUB7 to PUB9)
PD789426, 789436
Subseries
Total: 40 (CMOS I/O: 30, CMOS input: 6, N-ch open-drain I/O: 4)
Ports
PD789446, 789456
Subseries
Total: 30 (CMOS I/O: 20, CMOS input: 6, N-ch open-drain I/O: 4)
PD789426, 789436
Subseries
Total: 34 (software control: 30, mask option specification: 4)
Pull-up
resistors
PD789446, 789456
Subseries
Total: 24 (software control: 20, mask option specification: 4)
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