Rev. 1.00, 09/03, page 189 of 704
7.10 Port
9
Port 9 is an 8-bit I/O port. Port 9 pins also function as bus control I/O pins, system clock output
pins, and TPU I/O pins. Port 9 functions change according to the operating mode.
Port 9 has the following registers.
•
Port 9 data direction register (P9DDR)
•
Port 9 data register (P9DR)
•
Port 9 register (PORT9)
•
Port function control register (PFCR)
7.10.1
Port 9 Data Direction Register (P9DDR)
The individual bits in P9DDR specify input or output for the pins of port 9. The read value is
undefined.
Bit
Bit Name
Initial Value
R/W
Description
7
P97DDR
0
W
If port 9 pins are specified for use as the general
I/O port, the corresponding port 9 pins are output
ports when the P9DDR bits are set to 1, and input
ports when cleared to 0.
6
P96DDR
0
W
When this bit is set to 1, the corresponding port 9
pin is the system clock output pin (
φ
), and as a
general input port when cleared to 0.
5 P95DDR
0
W
4 P94DDR
0
W
3 P93DDR
0
W
2 P92DDR
0
W
1 P91DDR
0
W
0 P90DDR
0
W
If port 9 pins are specified for use as the general
I/O port, the corresponding port 9 pins are output
ports when the P9DDR bits are set to 1, and input
ports when cleared to 0.
Содержание H8S/2437
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