HD6432621 Hitachi, HD6432621 Datasheet - Page 310

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

Port D MOS Pull-Up Control Register (PDPCR)
PDPCR is an 8-bit readable/writable register that controls the MOS input pull-up function
incorporated into port D on an individual bit basis.
When a PDDDR bit is cleared to 0 (input port setting) in mode 7, setting the corresponding
PDPCR bit to 1 turns on the MOS input pull-up for the corresponding pin.
PDPCR is initialized to H'00 by a reset, and in hardware standby mode. It retains its prior state in
software standby mode.
9.8.3
In modes 4 to 6, port D pins automatically function as data bus input/output pins (D15 to D8). In
mode 7, each pin in port D functions as an input/output port, and input or output can be specified
individually for each pin. Port D pin functions are shown in table 9-16.
Table 9-16 Port D Pin Functions
Pin
PD7/D15,
PD6/D14,
PD5/D13,
PD4/D12,
PD3/D11,
PD2/D10,
PD1/D9,
PD0/D8
266
Bit
Initial value :
R/W
Pin Functions
:
:
Selection Method and Pin Functions
The pin function is switched as shown below according to the operating mode and
PDDDR.
Operating mode
PDnDDR
Pin function
PD7PCR PD6PCR PD5PCR PD4PCR PD3PCR PD2PCR PD1PCR PD0PCR
R/W
7
0
R/W
6
0
Data bus input/
(D15 to D8)
R/W
output
5
0
—
Modes 4 to 6
R/W
4
0
PDn input
R/W
3
0
0
R/W
2
0
R/W
PDn output
1
0
Mode 7
1
n = 7 to 0
R/W
0
0