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Chapter 2
Pin Functions
Preliminary User’s Manual U14913EE1V0UM00
(11) PCT0 to PCT4 (Port CT) … Input/output
Port CT is a 5-bit input/output port in which input or output can be set in 1-bit units.
Besides functioning as a port, in control mode (external expansion mode), it operates as control sig-
nal output when memory is expanded externally and segment signal output of LCD controller/driver.
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 to PCT4 can be set to input or output in 1-bit units using the port CT mode register (PMCT).
(b) Control mode
PCT0 to 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.
In the data bus, the lower byte is in effect. If the bus cycle is a lower memory write, it becomes
active at the falling edge of a T1 state CLKOUT signal and becomes inactive at the falling edge of a
T2 state CLKOUT signal.
(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.
In the data bus, the upper byte is in effect. If the bus cycle is an upper memory write, it becomes
active at the falling edge of a T1 state CLKOUT signal and becomes inactive at the falling edge of a
T2 state CLKOUT signal.
(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).
(f) SEG27 - SEG 31 Segment Signal output of LCD controller/driver … Output
These pins functions as segment signal output of LCD controller/driver.
Summary of Contents for V850E/CA1 ATOMIC
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