upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 48

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

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P40 to P42 (Port 4) … Bi-directional I/O
Port 4 is a 3-bit I/O port for which input and output can be set in 1-bit units.
In addition to I/O port pins, P40 to P42 can also be used as serial interface I/O in the control mode.
The port/control mode can be selected for each bit.
An on-chip pull-up and Pull-down resistor can be specified for use in 1-bit units using pull-up/ pull-
down resistor option register 4 (PU4, PD4).
(a) Port mode
P40 to P42 can be set to input or output in 1-bit units using port mode register 4 (PM4).
(b) Control mode
P40 to P42 can be set to control modes in 1-bit units using port mode control register 4 (PMC4)
• SIB0 (serial input) … Input
• SOB0 (serial output) … Output
• SCKB0 (serial clock) … Bi-directional I/O
This is the serial receive data input pin for CSIB0.
This is the serial transmit data output pin for CSIB0.
This is the serial clock I/O pin for CSIB0.
User’s Manual U16702EE3V2UD00
Chapter 2 Pin Functions