HD6432646 Hitachi, HD6432646 Datasheet - Page 308

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

9.11.3
In modes 4 to 6, each pin on port D automatically becomes one of the data bus I/O pins (D15 to
D8). In mode 7, each pin on port D functions as an I/O port and can be specified to function as an
input or output bit by bit.
The function of pins on port D are as listed in tables 9-23 (1) and 9-23 (2).
Table 9-23 (1)
Pins
PD7/D15, PD6/D14,
PD5/D13, PD4/D12,
PD3/D11, PD2/D10,
PD1/D9, PD0/D8
Table 9-23 (2)
Pins
PD7/D15/SEG9 to
PD0/D8/SEG16
Note: Modes 4 and 5 are expanded modes with on-chip ROM disabled.
274
If segment output is selected, data input/output and interfacing to external ROM are no
longer possible. Therefore segment output settings should not be made in these modes.
Pin Functions
Port D Pin Functions (H8S/2646, H8S/2646R, H8S/2645)
Port D Pin Functions (H8S/2648, H8S/2648R, H8S/2647)
Method of Selection and Pin Function
Pin functions are changed by a combination of the operating mode and the
PDDDR.
Operating mode
PDnDDR
Pin function
Method of Selection and Pin Function
Setting of SGS3
to SGS0
Operating mode Mode 4 to 6
PDDDR
Pin function
D15 to D8 I/O PD7 to PD0
Data bus I/O (D15 to D8)
—
Mode 4 to 6
—
input
Port
0
Mode 7
PD7 to PD0
PDn input
output
1
0
Mode 7
SEG output
PDn output
SEG9 to
SEG16
n = 7 to 0
—
—
1