HD64F2168 Datasheet, PDF (223/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

8.1 Port 1
Port 1 is an 8-bit I/O port. Port 1 pins also function as an address bus, PWM output pins, and
address/data multiplex bus. Port 1 functions change according to the operating mode. 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)
8.1.1 Port 1 Data Direction Register (P1DDR)
The individual bits of P1DDR specify input or output for the pins of port 1.
Bit Bit Name Initial Value R/W Description
7
P17DDR 0
W In normal extended mode (ADMXE = 0):
6
P16DDR 0
5
P15DDR 0
4
P14DDR 0
3
P13DDR 0
W The corresponding port 1 pins are address output
W ^{when P1DDR bits are set to 1, and input ports when}
cleared to 0.
W _{In address/data multiplex extended mode (ADMXE =}
W _1):
2
P12DDR 0
1
P11DDR 0
0
P10DDR 0
W When the bus width is 16 bits, lower 8 bits of
W ^{address/data multiplex bus. When the bus width is 8}
bits, this register is used in the same way as in single
W _{chip mode.}
In single-chip mode:
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. 3.00, 03/04, page 183 of 830