Chapter 6 Port Functions; Port Functions; Port Configuration - NEC PD789860 User Manual

6.1 Port Functions

µ
The PD789860, 789861 Subseries is provided with the ports shown in Table 6-1. These ports enable several
types of control.
These ports, while originally designed as digital input/output ports, have alternate functions. For the alternate
functions, see CHAPTER 3 PIN FUNCTIONS.
Name
Port 0 P00 to P07
Port 2 P20, P21
Port 4 P40 to P43

6.2 Port Configuration

Ports include the following hardware.
Item
Control registers
Ports
Pull-up resistors

CHAPTER 6 PORT FUNCTIONS

Table 6-1. Port Functions
Pin Name
I/O port. Input/output can be specified in 1-bit units.
I/O port. Input/output can be specified in 1-bit units.
Input-only port. Mask ROM versions can specify an on-chip pull-up resistor
by means of the mask option.
Table 6-2. Configuration of Port
Port mode registers (PMm: m = 0, 2)
Total: 14 (CMOS I/O: 10, CMOS input: 4)
Mask ROM version: 4 (mask option control only)
EEPROM version: None
User's Manual U14826EJ5V0UD
Function
Configuration
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