939
Chapter 20
Port Functions
User’s Manual U16580EE3V1UD00
20.3.12 Port
AL
Port AL is a 16-bit I/O port that can be set to input or output mode in 1-bit units. When the higher 8 bits
of port AL are used as port ALH (PALH) and the lower 8 bits as port ALL (PALL), port AL becomes two
8-bit ports that can be set in the input or output mode in 1-bit units.
(1)
Functions
•
Input/output data can be specified in 1-bit units by using the port register AL (PAL).
•
Input or output mode can be set in 1-bit units by using the port mode register AL (PMAL).
•
Port mode or control mode (for alternate function) can be specified in 1-bit units by using the
port mode control register AL (PMCAL).
Table 20-15:
Alternate Function Pins and Port Types of Port AL
Note:
Alternate function not available on
μ
PD70F3447.
Caution:
On the
μ
PD70F31187, in single-chip mode 1 or in ROM-less mode, this port has exter-
nal address bus function only. Reprogramming of port AL to port mode is not possi-
ble in these modes. Reading and writing of the port register PAL and port mode
register PMAL is possible but has no effect. Reading of the port mode control regis-
ter PMCAL is possible and the result is always FFFFH. Writing of the port mode con-
trol register PMCAL is not possible.
Port
Alternate Function
Remark
Port Type
Port AL
PAL0
to
PAL15
A0 to A15
Note
External address bus
Note
1
Содержание MuPD70F3187
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