NEC PD754144 - Manual (Page 89)

CHAPTER 6 PERIPHERAL HARDWARE FUNCTION
89 User’s Manual U10676EJ3V0UM
6.1.1 Types, features, and configurations of digital I/O ports
Table 6-1 shows the types of digital I/O ports.
Figures 6-2 to 6-9 show the configuration of each port.
Table 6-1. Types and Features of Digital Ports
Port Function Operation and Features Remarks
PORT3 4-bit I/O Can be set to input or output mode in 1-bit units. Also used for PTO0 to PTO2
pins.
PORT6 Also used for AVREF, INT0,
PTH00, and PTH01 pins.
PORT7 4-bit input 4-bit input only port Also used for KR4 to KR7 pins.
On-chip pull-up resistor can be specified by mask option
in 1-bits units.
PORT8 1-bit I/O Can be set to input or output mode in 1-bit units. –
P61 is shared with an external vector interrupt input pin and a noise eliminator is selectable (for details, refer to
7.3 Hardware Controlling Interrupt Function).
When the RESET signal is asserted, the output latches of ports 3, 6, and 8 are cleared to 0, the output buffers
are turned off, and the ports are set to the input mode.