H8S-2218 Datasheet, PDF (264/750 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2200 Series

Section 8 I/O Ports
8.1 Port 1
In the H8S/2218 Group, the port 1 is an 8-bit I/O port also functioning as address bus pins, TPU
I/O pins, and external interrupt input pins. In the H8S/2212 Group, the port 1 is an 8-bit I/O port
also functioning as TPU I/O pins and external interrupt input pins. The port 1 has the following
registers.
• Port 1 data direction register (P1DDR)
• Port 1 data register (P1DR)
• Port 1 register (PORT1)
8.1.1 Port 1 Data Direction Register (P1DDR)
P1DDR specifies input or output for the pins of the port 1.
Since P1DDR is a write-only register, the bit manipulation instructions must not be used to write
P1DDR. For details, see section 2.9.4, Accessing Registers Containing Write-Only Bits.
Bit Bit Name Initial Value
7 P17DDR 0
6 P16DDR 0
5 P15DDR 0
4 P14DDR 0
3 P13DDR 0
2 P12DDR 0
1 P11DDR 0
0 P10DDR 0
R/W Description
W (H8S/2218 Group)
W Modes 4 to 6:
W ^{If address output is enabled by the setting of bits AE3 to}
AE0 in PFCR, pins P13 to P10 are address outputs. Pins
W _{P17 to P14, and pins P13 to P10 when address output is}
W ^{disabled, are output ports when the corresponding}
W ^{P1DDR bits are set to 1, and input ports when the}
corresponding P1DDR bits are cleared to 0.
W _{Mode 7:}
W _{Setting a P1DDR bit to 1 makes the corresponding port 1}
pin an output port, while clearing the bit to 0 makes the
pin an input port.
(H8S/2212 Group)
Setting a P1DDR bit to 1 makes the corresponding port 1
pin an output port, while clearing the bit to 0 makes the
pin an input port.
Rev.6.00 Jun. 03, 2008 Page 216 of 698
REJ09B0074-0600