Section 8 I/O Ports; Table 8.1 Port Functions - Renesas H8SX/1520 Series Hardware Manual

Table 8.1 summarizes the port functions. The pins of each port also have other functions such as
input/output pins of on-chip peripheral modules or external interrupt input pins. Each I/O port
includes a data direction register (DDR) that controls input/output, a data register (DR) that stores
output data, a port register (PORT) used to read the pin states, and an input buffer control register
(ICR) that controls input buffer on/off. Ports 4 and 5 do not have a DR or a DDR register.
Ports D, H, J and K have internal input pull-up MOSs and a pull-up MOS control register (PCR)
that controls the on/off state of the input pull-up MOSs.
Port 2 includes an open-drain control register (ODR) that controls on/off of the output buffer
PMOSs.
Ports 1, 2, 3, 6, A, D, H, J, and K can drive a single TTL load and capacitive loads up to 30 pF.
All of the I/O ports can drive Darlington transistors when functioning as output ports.
Schmitt-trigger inputs are enabled when a port is used as the IRQ and TPU inputs.
Table 8.1
Port Description
Port 1 General I/O port
also functioning
as interrupt inputs,
SCI I/Os, and A/D
converter inputs
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Section 8 I/O Ports

Port Functions
Bit I/O
7 P17
6 P16/SCK3
5 P15
4 P14
3 P13
2 P12
1 P11
0 P10
Function
Input Output
ADTRG1/

IRQ7
IRQ6


RxD3/
IRQ5
IRQ4
TxD3
ADTRG0/

IRQ3
IRQ2

IRQ1

IRQ0

Rev. 3.00 Mar. 14, 2006 Page 205 of 804
Section 8 I/O Ports
Input Open-
Schmitt- Pull-up Drain
Trigger MOS Output
1
Input* Function Function
IRQ7
 
IRQ6
IRQ5
IRQ4
IRQ3
IRQ2
IRQ1
IRQ0
REJ09B0104-0300