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Chapter 2
Pin Functions
User’s Manual U16580EE3V1UD00
(15) PDH0 to PDH15 (Port DH) … I/O
Port DH is an 8-bit or a 16-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 the data bus
Note
(D16 to D31) when memory is expanded externally.
The operation mode can be specified by the port DH mode control register (PMCDH) to port or
control mode for each port pin individually.
(a) Port mode
PDH0 to PDH15 can be set to input or output in 1-bit units using the port DH mode register
(PMDH).
(b) Control mode
PDH0 to PDH15 can be set to port or control mode in 1-bit units using the PMCDH register.
(i) D16 to D31 (Address bus) … 3-state I/O
Note
These are the data I/O pins of the higher 16 bits of the 32-bit data bus when the external
memory is accessed.
(16) PCD2 to PCD5 (Port CD) … I/O
Port CD 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
Note
when memory is expanded externally.
The operation mode can be specified by the port CD mode control register (PMCCD) to port or
control mode for each port pin individually.
(a) Port mode
PCD2 to PCD5 can be set to input or output in 1-bit units using the port CD mode register
(PMCD).
(b) Control mode
PCD2 to PCD5 can be set to port or control mode in 1-bit units using the PMCCD register.
(i) BEN0 to BEN3 (Byte enable) … 3-state output
Note
These are the byte enable control signal pins, which indicate the validity of the corresponding
byte on the 32-bit data bus.
Note:
not available on
μ
PD70F3447
Содержание MuPD70F3187
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