HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 170

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HD6475328-CP10

Manufacturer Part Number
HD6475328-CP10
Description
original Hitachi CMOS microcomputer unit (MCU)
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
2. Port 3 Data Register (P3DR)—H'FF86
Bit
Initial value
Read/Write
P3DR is an 8-bit register containing the data for pins P3
At a reset and in the hardware standby mode, P3DR is initialized to H'00.
When the CPU reads P3DR, for output pins it reads the value in the P3DR latch, but for input
pins, it obtains the pin status directly.
9.4.3 Pin Functions in Each Mode
Port 3 has different functions in the expanded modes (modes 1, 2, 3, 4) and the single-chip mode
(mode 7). Separate descriptions are given below.
Pin Functions in Expanded Modes: In the expanded modes (modes 1, 2, 3, and 4), port 3 is
automatically used as the data bus and P3DDR is ignored. Figure 9-6 shows the pin functions
for the expanded modes.
R/W
P3
7
0
7
Figure 9-6 Port 3 Pin Functions in Expanded Modes
Port
3
R/W
P3
6
0
6
R/W
P3
5
0
5
D
D
D
D
D
D
D
D
7
6
5
4
3
2
1
0
153
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)
R/W
P3
4
0
4
7
to P3
R/W
P3
3
0
3
0
.
R/W
P3
2
0
2
R/W
P3
1
0
1
R/W
P3
0
0
0

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