961
Chapter 20
Port Functions
User’s Manual U16580EE3V1UD00
20.3.19 Port
CD
Port CD is a 4-bit I/O port that can be set to 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 CD (PCD).
•
Input or output mode can be set in 1-bit units by using the port mode register CD (PMCD).
•
Port mode or control mode (for alternate function) can be specified in 1-bit units by using the
port mode control register CD (PMCCD).
Table 20-22:
Alternate Function Pins and Port Types of Port CD
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 control bus function only. Reprogramming of port CD to port mode is not possi-
ble in these modes. Reading and writing of the port register PCD and port mode
register PMCD is possible but has no effect. Reading of the port mode control regis-
ter PMCCD is possible and the result is always 3CH. Writing of the port mode control
register PMCCD is not possible.
(2)
Control registers
(a) Port register CD (PCD)
The PCD register is an 8-bit register that controls reading the pin levels and writing the output
levels of port pins PCD2 to PCD5.
This register can be read or written in 8-bit or 1-bit units.
Reset input causes an undefined register content.
Figure 20-79:
Port Register CD (PCD)
Port
Alternate Function
Remark
Port Type
Port CD
PCD2
BEN0
Note
Byte enable signal output
Note
1
PCD3
BEN1
Note
PCD4
BEN2
Note
PCD5
BEN3
Note
After reset:
Undefined
R/W
Address:
FFFFF00EH
7
6
5
4
3
2
1
0
PCD
0
0
PCD5
PCD4
PCD3
PCD2
0
0
Содержание V850E/PH2
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