HD6432621 Hitachi, HD6432621 Datasheet - Page 320

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

9.10.3
Port F pins also function as external interrupt input pins (IRQ2 and IRQ3), BUZZ output pin*,
A/D trigger input pin (ADTRG), bus control signal input/output pins (AS, RD, HWR, LWR,
WAIT, BREQO, BREQ, and BACK) and the system clock (ø) output pin. The pin functions differ
between modes 4 to 6, and mode 7. Port F pin functions are shown in table 9-22.
Note: * BUZZ output pin in the H8S/2626 Series only.
Table 9-22 Port F Pin Functions
Pin
PF7/ø
PF6/AS
PF5/RD
PF4/HWR
276
Pin Functions
Selection Method and Pin Functions
The pin function is switched as shown below according to bit PF7DDR.
The pin function is switched as shown below according to the operating mode
and bit PF6DDR.
The pin function is switched as shown below according to the operating mode
and bit PF5DDR.
The pin function is switched as shown below according to the operating mode
and bit PF4DDR.
PF7DDR
Pin function
Operating
Mode
PF6DDR
Pin function
Operating
Mode
PF5DDR
Pin function
Operating
Mode
PF4DDR
Pin function
Modes 4 to 6
Modes 4 to 6
Modes 4 to 6
HWR output
AS output
RD output
—
—
—
PF7 input
0
PF6 input
PF5 input
PF4 input
0
0
0
Mode 7
Mode 7
Mode 7
ø output
1
PF6 output
PF5 output
PF4 output
1
1
1