HD6433308 Datasheet, PDF (99/349 Pages) Hitachi Semiconductor – Hitachi Single-Chip MicroComputer

Hardware standby
Mode 3
P2 n
Mode 1,oorr22
Mode 1 Reset
S* R
Q
D
P2n DDR
C_*
WP2D
Reset
R
Q
D
P2n DR
C
WP2
RP2
WP2D: Write Port 2 DDR
WP2: Write Port 2
RP2: Read Port 2
n = 0 to7
* Set-priority
Figure 5-2. Port 2 Schematic Diagram
5.4 Port 3
Port 3 is an 8-bit input/output port that also provides the external data bus and dual-port RAM
(master-slave) data bus. The function of port 3 depends on the MCU mode as indicated in table
5-6.
Table 5-6. Functions of Port 3
Mode 1
Data bus
Mode 2
Data bus
Mode 3
DPME = "0"
DPME = "1"
Input/output port Dual-port RAM data bus
Pins of port 3 can drive a single TTL load and a 90pF capacitive load when they are used as output
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