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Chapter 2
Pin Functions
Preliminary User’s Manual U15839EE1V0UM00
(11) PCT0, PCT1, PCT4 (Port CT) … Input/output
Port CT is a 3-bit input/output port in which input or output can be set in 1-bit units.
Besides functioning as a port, in control mode, it operates as control signal output when memory
is accessed externally.
An operation mode of port or control mode can be selected for each bit and specified by the port
CT code control register (PMCCT).
(a) Port mode
PCT0, PCT1, PCT4 can be set to input or output in 1-bit units using the port CT mode register
(PMCT).
(b) Control mode
PCT0, PCT1, PCT4 can be used as LWR, UWR, RD by using PMCCT.
(c) LWR (Lower byte write strobe) … Output
This is a strobe signal that shows that the executing bus cycle is a write cycle for SRAM, external
ROM, or an external peripheral I/O area.
(d) UWR (Upper byte write strobe) … Output
This is a strobe signal that shows that the executing bus cycle is a write cycle for SRAM, external
ROM, or an external peripheral I/O area.
(e) RD (Read strobe) … Output
This is a strobe signal that shows that the executing bus cycle is a read cycle for SRAM, external
ROM, or external peripheral I/O. It is inactive in an idle state (TI).
(12) PCM0 (Port CM) … Input/output
Port CM is a 1-bit input/output port in which input or output can be set in 1-bit units.
Besides functioning as a port, in control mode, it operates as control signal output when memory
is accessed externally.
An operation mode of port or control mode can be selected for each bit and specified by the port
CM code control register (PMCCM).
(a) Port mode
PCM0 can be set to input or output in 1-bit units using the port CM mode register (PMCM).
(b) Control mode
PCM0 can be used as WAIT by using PMCCM.
(c) WAIT (Wait) … Input
This control signal input pin, which inserts a data wait in a bus cycle. If the setup or hold time is not
secured in the sampling timing, wait insertion may not be performed.
Summary of Contents for mPD703128
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