h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 284
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h8s-2172
Manufacturer Part Number
h8s-2172
Description
Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2172.pdf
(570 pages)
- Current page: 284 of 570
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8.8.3
PORT8 shows the pin states of the port 8. PORT8 cannot be modified.
Note:
8.8.4
Port 8 pins also function as the pins for external data bus I/O. The correspondence between the
register specification and the pin functions is shown below.
• P87/D15
• P86/D14
Rev. 2.00, 03/04, page 252 of 534
Bit
7
6
5
4
3
2
1
0
EXPE
P87DDR
Pin function
EXPE
P86DDR
Pin function
The pin function is switched as shown below according to the combination of the P87DDR bit
and the EXPE bit in MDCR.
The pin function is switched as shown below according to the combination of the P86DDR bit
and the EXPE bit in MDCR.
Bit Name
P87
P86
P85
P84
P83
P82
P81
P80
*
Port 8 Register (PORT8)
Pin Functions
Determined by the states of pins P87 to P80.
Initial
Value
*
*
*
*
*
*
*
*
P87 input
P86 input
R/W
R
R
R
R
R
R
R
R
0
0
Description
If a PORT8 read is performed while P8DDR bits are
set to 1, the P8DR values are read. If a PORT8 read
is performed while P8DDR bits are cleared to 0, the
pin states are read.
0
0
P87 output
P86 output
1
1
D15 I/O
D14 I/O
1
1
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