HD6433308 HITACHI [Hitachi Semiconductor], HD6433308 Datasheet - Page 129
HD6433308
Manufacturer Part Number
HD6433308
Description
Hitachi Single-Chip MicroComputer
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6433308.pdf
(349 pages)
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5.10 Port 9
Port 9 is an 8-bit input/output port that also provides pins for interrupt input (IRQ
trigger input, system clock (Ø) output, bus control signals (in the expanded modes), and dual-port
RAM interface control signals (in the single-chip mode).
Pins P9
functions in all modes. Table 5-18 lists the pin functions.
Table 5-18. Port 9 Pin Functions
Pin
P9
P9
P9
P9
P9
P9
P9
P9
Pins of port 9 can drive a single TTL load and a 90pF capacitive load when they are used as output
pins. When used as input pins, they have programmable MOS pull-ups.
Table 5-19 details the port 9 registers.
Table 5-19. Port 9 Registers
Name
Port 9 data direction register P9DDR
Port 9 data register
0
1
2
3
4
5
6
7
7
to P9
Expanded modes
P9
P9
P9
RD output
WR output
AS output
WAIT input
Ø output
3
0
1
2
have different functions in different modes. Pins P9
input/output , IRQ
input/output and IRQ
input/output and IRQ
Abbreviation
P9DR
2
input, and ADTRG input (simultaneously)
1
0
input (simultaneously)
input (simultaneously)
DPME = 0
P9
P9
P9
P9
P9
3
4
5
6
7
input/output
input/output
input/output
input or Ø output
input/output
Read/Write
W
R/W
114
Single-chip mode
Initial value
H’40 (modes 1 and 2)
H'00 (mode 3
H’00
2
to P9
DPME = 1
CS input
OE input
RDY output
P9
WE input
6
0
input or Ø output
have the same
0
to IRQ
Address
H’FFC1
2
H’FFC0
), A/D
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