INPUT/OUTPUT PINS
5.1 Overview, 5.2 Programmable I/O ports
5.1 Overview
Input/output pins (hereafter called I/O pins) have functions as programmable I/O port pins, internal peripheral
devices’s I/O pins, etc.
For the basic functions of each I/O pin, refer to section “1.3 Pin description.” For the I/O functions of the
internal peripheral devices, refer to relevant sections of each internal peripheral device.
This chapter describes the programmable I/O ports and examples of handling unused pins.
5.2 Programmable I/O ports
The programmable I/O ports have direction registers and port registers in the SFR area. Figure 5.2.1 shows
the memory map of direction registers and port registers.
Addresses
3
16
16
16
16
16
16
16
16
16
16
16
16
16
Port P1 register
(Note)
4
5
Port P1 direction register
6
Port P2 register
(Note)
7
8
Port P2 direction register
(Note)
9
A
B
C
D
E
F
(Note)
Port P5 register
(Note)
Port P5 direction register
Port P6 register
Port P7 register
Port P6 direction register
1016
1116
Port P7 direction register
Note: Do not write to this address.
Fig. 5.2.1 Memory map of direction registers and port registers
7906 Group User’s Manual Rev.2.0
5-2
RENESAS [ RENESAS TECHNOLOGY CORP ]
