HD6432646 Hitachi, HD6432646 Datasheet - Page 303

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

Port C Open Drain Control Register (PCODR)
PCODR is an 8-bit readable/writable register and controls PMOS On/Off of each pin (PC7 to
PC0) of port C.
If PCODR is set to 1 by setting AE3 to AE0 in PFCR in mode other than address output mode,
port C pins function as NMOS open drain outputs and when the setting is cleared to 0, the pins
function as CMOS outputs.
Do not set PCODR to 1 if the pins are being used for LCD driver output.
PCODR is initialized to H'00 in reset mode or hardware standby mode. PCODR retains the last
state in software standby mode.
9.10.3
Port C can function as LCD segment output pins (H8S/2646, H8S/2646R, H8S/2645: SEG8 to
SEG1, H8S/2648, H8S/2648R, H8S/2647: SEG24 to SEG17) and as address bus outputs. The pin
functions differ in modes 4, 5, 6, and 7. The port C pin functions are listed in table 9-20.
Table 9-20 Port C Pin Functions
Note: Modes 4 and 5 are extended modes in which the internal ROM is disabled. Address output
Bit
Initial value
Read/Write
Setting of
SGS3 to
SGS0
Operating
mode
PCnDDR
Pin function
is disabled when port C is set to segment output, so it is not possible to interface with
external ROM. Therefore port C must not be set to segment output in mode 4 or mode 5.
Pin Functions
PC7ODR
Modes
4 and 5
A7 to A0
R/W
output
7
0
—
PC6ODR
PC0 input
R/W
PC7 to
6
0
0
Mode 6
PC5ODR
R/W
5
0
A7 to A0
output
Port
1
PC4ODR
R/W
4
0
PC0 input
PC7 to
0
PC3ODR
Mode 7
R/W
3
0
PC0 output
PC7 to
PC2ODR
1
R/W
2
0
H8S/2646R,
H8S/2646,
H8S/2645
SEG8 to
SEG1
output
PC1ODR
—
—
R/W
SEG output
1
0
H8S/2648R,
PC0ODR
H8S/2648,
H8S/2647
SEG24 to
SEG17
output
R/W
0
0
—
—
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