HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 165

• Manufacturer Part Number: HD6475328-CP10
• Description: original Hitachi CMOS microcomputer unit (MCU)
• Manufacturer: HITACHI [Hitachi Semiconductor]

Table 9-4 Port 1 Pin Functions in Single-Chip Modes (cont)
Pin
P1
P1
P1
9.3 Port 2
9.3.1 Overview
Port 2 is a five-bit input/output port with the pin configuration shown in figure 9-2. It functions as
an input/output port only in the single-chip mode. In the expanded modes it is used for output of
bus control signals.
Outputs from port 2 can drive one TTL load and a 90pF capacitive load. They can also drive a
Darlington transistor pair.
Port
2
1
0
2
/ E
/ ø
P2
P2
P2
P2
P2
Selection of Pin Functions
P1
Pin function
P1
Pin function
P1
Pin function
Pin
4
3
2
1
0
2
1
0
/ WR
/ RD
/ DS
/ R/W
/ AS
DDR
DDR
DDR
Figure 9-2 Pin Functions of Port 2
Expanded Modes
WR (output)
RD (output)
DS (output)
R/W (output)
AS (output)
Input
Input
Input
0
0
0
E clock output
ø clock output
Output
148
1
1
1
Single-Chip Mode
P2
P2
P2
P2
P2
4
3
2
1
0
(input/output)
(input/output)
(input/output)
(input/output)
(input/output)