H83217 Datasheet, PDF (125/520 Pages) Renesas Technology Corp – Single-Chip Microcomputer

Section 7 I/O Ports
7.1 Overview
The H8/3217 Series has five 8-bit input/output ports, one 7-bit input/output port, and one 6-bit
input/output port.
Table 7-1 lists the functions of each port in each operating mode. As table 7-1 indicates, the port
pins are multiplexed, and the pin functions differ depending on the operating mode.
Each port has a data direction register (DDR) that selects input or output, and a data register (DR)
that stores output data. If bit manipulation instructions will be executed on the port data direction
registers, see “Notes on Bit Manipulation Instructions” in section 2.5.5, Bit Manipulations.
Ports 1, 2, 3, 6, and 7 can drive one TTL load and a 90-pF capacitive load. Port 4 (excluding pin
P4₆) and port 5 can drive one TTL load and a 30-pF capacitive load. Ports 1, 2, and 3 can drive
LEDs (with 10-mA current sink). Ports 1 to 7 can drive a Darlington transistor. Ports 1 to 3 and
pins P6₀ to P6₃ and P7₀ to P7₃ have built-in MOS pull-ups.
Pins P7₀ to P7₃ (including SCL and SDA) of port 7 can drive a bus buffer. See section 14, I²C Bus
Interface, for details of bus buffer driving.
Note that the H8/3212 and H8/3202 have a subset specification that does not include certain of the
on-chip supporting modules. See tables 1-2 to 1-4, Pin Assignments in Each Operating Mode, and
table 7-1, Port Functions, for differences in the pin functions.
For block diagrams of the ports, see appendix C, I/O Port Block Diagrams.
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