HD64F3437TFI16V Renesas Electronics America, HD64F3437TFI16V Datasheet - Page 170
HD64F3437TFI16V
Manufacturer Part Number
HD64F3437TFI16V
Description
MCU FLASH 60K 100-TQFP
Manufacturer
Renesas Electronics America
Datasheet
1.HD64F3437TFI16V.pdf
(755 pages)
Specifications of HD64F3437TFI16V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Port 8 Data Direction Register (P8DDR)
P8DDR is an 8-bit register that controls the input/output direction of each pin in port 8. A pin
functions as an output pin if the corresponding P8DDR bit is set to 1, and as an input pin if this bit
is cleared to 0. P8DDR is a write-only register. Read data is invalid. If read, all bits always read 1.
Bit 7 is a reserved bit that always reads 1.
P8DDR is initialized to H'80 by a reset and in hardware standby mode. In software standby mode
P8DDR retains its existing values, so if a transition to software standby mode occurs while a
P8DDR bit is set to 1, the corresponding pin remains in the output state.
Port 8 Data Register (P8DR)
P8DR is an 8-bit register that stores data for pins P8
reads 1.
When a P8DDR bit is set to 1, if port 8 is read, the value in P8DR is obtained directly, regardless
of the actual pin state. When a P8DDR bit is cleared to 0, if port 8 is read the pin state is obtained.
This also applies to pins used by on-chip supporting modules.
P8DR is initialized to H'80 by a reset and in hardware standby mode. In software standby mode it
retains its existing values.
138
Bit
Initial value
Read/Write
Bit
Initial value
Read/Write
—
—
—
—
7
1
7
1
P8
R/W
P8
6
W
6
DDR P8
0
6
0
6
R/W
P8
5
W
5
DDR P8
0
5
0
5
R/W
P8
4
W
4
DDR P8
0
4
0
6
to P8
4
0
. Bit 7 is a reserved bit that always
R/W
P8
3
W
3
DDR P8
0
3
0
3
R/W
P8
2
W
2
DDR P8
0
2
0
2
R/W
P8
1
W
1
DDR P8
0
1
0
1
R/W
P8
0
W
0
DDR
0
0
0
0
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