H8SX1544 Datasheet, PDF (313/974 Pages) Renesas Technology Corp – Renesas 32-Bit CISC Microcomputer H8SX Family/H8SX/1500 Series

Section 8 I/O Ports
Section 8 I/O Ports
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 D to 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.
Ports 2 and F include an open-drain control register (ODR) that controls on/off of the output
buffer PMOSs.
All of the I/O ports 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, TPU, and IIC inputs.
Table 8.1 Port Functions
Port Description
Bit
Port 1
General I/O port 7
also functioning
as interrupt inputs, ₆
SCI I/Os, DMAC
I/Os, A/D
converter inputs, ⁵
and IIC2 I/Os
4
I/O
P17/SCL0
P16/SDA0
P15/SCL1
P14/SDA1
3 P13
2 P12/SCK2
1 P11
0 P10
Function
Input
IRQ7-A/
ADTRG1
IRQ6-A
Output
⎯
DACK1_A
IRQ5-A
TEND1_A
IRQ4-A/
DREQ1_A
IRQ3-A/
ADTRG0
IRQ2-A
⎯
⎯
DACK0_A
IRQ1-A/
RxD2
IRQ0-A/
DREQ0_A
TEND0_A
TxD2
Schmitt-
Trigger
Input*¹
IRQ7-A,
SCL0
IRQ6-A,
SDA0
IRQ5-A,
SCL1
IRQ4-A,
SDA1
IRQ3-A
Input
Pull-up
MOS
Function
Open-
Drain
Output
Function
⎯
*²
*²
*²
*²
⎯
IRQ2-A
IRQ1-A
IRQ0-A
Rev.2.00 Oct. 16, 2007 Page 259 of 916
REJ09B0381-0200