HD6433308 Datasheet, PDF (129/349 Pages) Hitachi Semiconductor – Hitachi Single-Chip MicroComputer

5.10 Port 9
Port 9 is an 8-bit input/output port that also provides pins for interrupt input (IRQ0 to IRQ2), A/D
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 P97 to P93 have different functions in different modes. Pins P92 to P90 have the same
functions in all modes. Table 5-18 lists the pin functions.
Table 5-18. Port 9 Pin Functions
Single-chip mode
Pin
Expanded modes
DPME = 0
DPME = 1
P90
P90 input/output , IRQ2 input, and ADTRG input (simultaneously)
P91
P91 input/output and IRQ1 input (simultaneously)
P92
P92 input/output and IRQ0 input (simultaneously)
P93
RD output
P93 input/output
CS input
P94
WR output
P94 input/output
OE input
P95
AS output
P95 input/output
RDY output
P96
Ø output
P96 input or Ø output
P96 input or Ø output
P97
WAIT input
P97 input/output
WE input
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
Abbreviation
Port 9 data direction register P9DDR
Port 9 data register
P9DR
Read/Write
W
R/W
Initial value
Address
H’40 (modes 1 and 2) H’FFC0
H'00 (mode 3
H’00
H’FFC1
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