upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 52

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

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PCM0 to PCM3 (Port CM) … Bi-directional I/O
Port CM is a 4-bit I/O port for which input and output can be set in 1-bit units.
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 CM (PUCM, PDCM).
(a) Port mode
PCM0 to PCM3 can be set to input or output in 1-bit units using port mode register CM (PMCM).
(b) Control mode
PCM0 to PCM3 can be set to control modes in 1-bit units using port mode control register CM
(PMCCM).
- HLDAK (hold acknowledge) … Output
- HLDRQ (hold request) … Input
- CLKOUT (clock out) … Output
- WAIT (wait) … Input
This is an output pin for the acknowledge signal that indicates the high-impedance status for
the address bus, data bus, and control bus when V850E/RS1 receives a bus hold request.
The address bus, data bus, and control bus are in high impedance while this signal is active.
This is an input pin by which an external device requests the V850E/RS1 to release the
address bus, data bus, and control bus release requests. This pin accepts asynchronous
input for CLKOUT. When this pin is made active, V850E/RS1 sets the address bus, data bus,
and control bus to high impedance upon the end of the bus cycle currently being executed,
or immediately if no bus cycle is being executed, and the HLDAK signal is then made active
and the bus is released.
This pin outputs internally generated bus clocks.
This is the input pin for the control signal used to insert waits into the bus cycle. This pin is
sampled at the falling edge of the clock during the T2 or TW state of the bus cycle.
ON/OFF switching of the wait function is performed with port mode control register CM
(PMCCM).
User’s Manual U16702EE3V2UD00
Chapter 2 Pin Functions