395
10.12.3
Pin Functions
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
,
LCAS
,
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 10-21.
Table 10-21 Port F Pin Functions
Pin
Selection Method and Pin Functions
PF7/ø
The pin function is switched as shown below according to bit PF7DDR.
PF7DDR
0
1
Pin function
PF7 input pin
ø output pin
PF6/
AS
/
LCAS
The pin function is switched as shown below according to the combination of
the operating mode and bits RMTS2 to RMTS0, LCASS, BREQOE, WAITE,
ABW5 to ABW2, and PF2DDR.
Operating
Mode
Modes 4 to 6
Mode 7
LCASS
0
1
*
—
PF6DDR
—
—
0
1
Pin function
AS
output pin
LCAS
output pin
PF6 input pin PF6 output pin
Note:
*
Restricted to RMTS2 to TMTS0=B'001 to B'011, DRAM space 16-bit
access in modes 4 to 6 only
PF5/
RD
The pin function is switched as shown below according to the operating mode
and bit PF5DDR.
Operating
Mode
Modes 4 to 6
Mode 7
PF5DDR
—
0
1
Pin function
RD
output pin
PF5 input pin
PF5 output pin
PF4/
HWR
The pin function is switched as shown below according to the operating mode
and bit PF4DDR.
Operating
Mode
Modes 4 to 6
Mode 7
PF4DDR
—
0
1
Pin function
HWR
output pin
PF4 input pin
PF4 output pin
Содержание H8S/2631
Страница 28: ...xviii Appendix G Package Dimensions 1154 ...
Страница 341: ...316 Transfer SAR or DAR DAR or SAR Block area First block Nth block Figure 9 8 Memory Mapping in Block Transfer Mode ...
Страница 918: ...905 ø DREQ0 DREQ1 tDRQS tDRQH Figure 25 19 DMAC DREQ Input Timing ...
Страница 955: ...943 A 2 Instruction Codes Table A 2 shows the instruction codes ...