upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 54

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

(10) PCT0, PCT1, PCT4, PCT6 (Port CT) … Bi-directional I/O
54
Port CT is a 4-bit I/O port for which input and output can be set in 1-bit units.
In addition to I/O pins, PCT0, PCT1, PCT4, PCT6 can also be used as control signal output pins
for external memory expansion 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 CT (PUCT, PDCT).
(a) Port mode
PCT0, PCT1, PCT4, PCT6 can be set to input or output in 1-bit units using port CT mode register
(PMCT).
(b) Control mode
PCT0, PCT1, PCT4, PCT6 can be set to control modes in 1-bit units using port mode control reg-
ister CT (PMCCT).
- WR0 (write strobe low-level data) … Output
- WR1 (write strobe high-level data) … Output
- RD (read strobe) … Output
- ASTB (address strobe) … Output
This is the write strobe signal output pin for the lower data of the external 16-bit data bus.
This is the write strobe signal output pin for the higher data of the external 16-bit data bus.
This is the read strobe signal output pin for the external 16-bit data bus.
This is the output pin for the latch strobe signal for the external address bus. Output
becomes low level in synchronization with the falling edge of the clock during the T1 state of
the bus cycle, and becomes high level in synchronization with the falling edge of the clock
during the T3 state of the bus cycle. Output becomes high level when the bus cycle is
inactive.
User’s Manual U16702EE3V2UD00
Chapter 2 Pin Functions