NEC V850E/PH2 User Manual page 72

(17) PCM0, PCM1, PCM6, PCM7 (Port CM) ... I/O
Port CM is a 4-bit I/O port in which input or output can be set for each port pin individually.
Besides functioning as a port, in control mode, these pins operate as control signal input
memory is expanded externally.
The operation mode can be specified by the port CM mode control register (PMCCM) to port or
control mode for each port pin individually.
(a) Port mode
PCM0, PCM1, PCM6, and PCM7 can be set to input or output in 1-bit units using the port CM
mode register (PMCM).
(b) Control mode
PCM0 can be set to port or control mode in 1-bit units using the PMCCM register.
(i) WAIT (Wait) ... Input
This is the control signal input pin at which an external data wait is inserted into the bus cycle.
The WAIT signal can be input asynchronously, and is sampled at the falling edge of the BCLK
signal. When the setup or hold time is terminated within the sampling timing, wait insertion
may not be executed.
(18) PCS0, PCS1, PCS3, PCS4 (Port CS) ... I/O
Port CS is a 4-bit I/O port in which input or output can be set for each port pin individually.
Besides functioning as a port, in control mode, these pins operate as control signal outputs
when
memory is expanded externally.
The operation mode can be specified by the port CS mode control register (PMCCS) to port or
control mode for each port pin individually.
(a) Port mode
PCS0, PCS1, PCS3, and PCS4 can be set to input or output in 1-bit units using the port CS mode
register (PMCS).
(b) Control mode
PCS0, PCS1, PCS3, and PCS4 can be set to port or control mode in 1-bit units using the PMCCS
register.
(i) CS0, CS1, CS3, CS4 (Chip select) ... 3-state output
These are the chip select signal output pins for the external memory or peripheral I/O
extension areas.
The CSn signal is assigned to the memory block n (n = 0, 1, 3, 4).
It becomes active while the bus cycle that accesses the corresponding memory block is
activated. In the idle state (TI), it becomes inactive.
Note: not available on μPD70F3447
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Chapter 2 Pin Functions
Note
User's Manual U16580EE3V1UD00
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