HD64F2145 Datasheet, PDF (200/829 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

8.2 Port 1
Port 1 is an 8-bit I/O port. Port 1 pins also function as an address bus and PWM output pins. Port 1
functions change according to the operating mode. Port 1 has an on-chip input pull-up MOS
function that can be controlled by software. Port 1 has the following registers.
• Port 1 data direction register (P1DDR)
• Port 1 data register (P1DR)
• Port 1 pull-up MOS control register (P1PCR)
8.2.1 Port 1 Data Direction Register (P1DDR)
P1DDR specifies input or output for the pins of port 1 on a bit-by-bit basis.
Bit Bit Name Initial Value R/W Description
7
P17DDR 0
W
In mode 1:
6
P16DDR 0
5
P15DDR 0
4
P14DDR 0
3
P13DDR 0
2
P12DDR 0
W
Each pin of port 1 is address output regardless of
W
the set value of P1DDR.
W
In modes 2 and 3 (EXPE=1):
The corresponding port 1 pins are address output or
W
PWM output ports when P1DDR bits are set to 1,
W
and input ports when cleared to 0.
1
P11DDR 0
W
In modes 2 and 3 (EXPE=0):
0
P10DDR 0
W
The corresponding port 1 pins are output ports or
PWM outputs when the P1DDR bits are set to 1,
and input ports when cleared to 0.
Rev. 2.0, 08/02, page 160 of 788