HD64F2149 Datasheet, PDF (223/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

Section 8 I/O Ports
8.1 Overview
The H8S/2149 has ten I/O ports (ports 1 to 6, 8, 9, A, and B), and one input-only port (port 7).
For additional ports C, D, E, F, and G in H8S/2169, see section 8.13 Additional Overview for
H8S/2169.
Tables 8.1 is a summary of the port functions. The pins of each port also have other functions.
Each port includes a data direction register (DDR) that controls input/output (not provided for the
input-only port) and data registers (DR, ODR) that store output data.
Ports 1 to 3, 6, A, and B have a built-in MOS input pull-up function. For ports A and B, the on/off
status of the MOS input pull-up is controlled by DDR and ODR. Ports 1 to 3 and 6 have a MOS
input pull-up control register (PCR), in addition to DDR and DR, to control the on/off status of the
MOS input pull-ups.
Ports 1 to 6, 8, 9, A, and B can drive a single TTL load and 30 pF capacitive load. All the I/O
ports can drive a Darlington transistor when in output mode. Ports 1, 2, and 3 can drive an LED
(10 mA sink current).
Port A input and output use by the VCCB power supply, which is independent of the V_CC power
supply. When the VCCB voltage is 5V, the pins on port A will be 5-V tolerant. PA4 to PA7 of
port A have bus-buffer drive capability. P52 in port 5 and P97 in port 9 are NMOS push-pull
outputs. P52 and P97 are thus 5-V tolerant, with DC characteristics that are dependent on the V_CC
voltage.
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