HD6433308 Datasheet, PDF (33/349 Pages) Hitachi Semiconductor – Hitachi Single-Chip MicroComputer

Table 1-3. Pin Functions (4)
Type
Symbol I/O Name and function
Dual-port DDB7
I/O Dual-port RAM Data Bus: Bidirectional 8-bit bus by which
RAM to DDB0
an external CPU can access the dual-port RAM.
CS
I Chip Select: Input pin for selecting the dual-port RAM.
RS3 to RS0 I Register Select: Input pins for addressing the dual-port RAM.
OE
I Output Enable: Enables output on DDB7 to DDB0.
WE
I Write Enable: Enables writing to the dual-port RAM.
RDY
O ReaDY: For sending an interrupt request signal to an external
CPU. NMOS open-drain output.
General- P17 to P10 I/O Port 1: An 8-bit input/output port with programmable MOS input
purpose
pull-ups and LED driving capability. The direction of each bit can
I/O
be selected in the port 1 data direction register (P1DDR).
P27 to P20 I/O Port 2: An 8-bit input/output port with programmable MOS input
pull-ups and LED driving capability. The direction of each bit can
be selected in the port 2 data direction register (P2DDR).
P37 to P30 I/O Port 3: An 8-bit input/output port with programmable MOS input
pull-ups. The direction of each bit can be selected in the port 3
data direction register (P3DDR).
P47 to P40 I/O Port 4: An 8-bit input/output port with programmable MOS input
pull-ups. The direction of each bit can be selected in the port 4
data direction register (P4DDR).
P52 to P50 I/O Port 5: A 3-bit input/output port with programmable MOS input
pull-ups. The direction of each bit can be selected in the port 5
data direction register (P5DDR).
P67 to P60 I/O Port 6: An 8-bit input/output port with programmable MOS input
pull-ups. The direction of each bit can be selected in the port 6
data direction register (P6DDR).
P77 to P70 I Port 7: An 8-bit input port.
P86 to P80 I/O Port 8: A 7-bit input/output port with programmable MOS input
pull-ups. The direction of each bit can be selected in the port 8
data direction register (P8DDR).
P97 to P90 I/O Port 9: An 8-bit input/output port with programmable MOS input
pull-ups. The direction of each bit can be selected in the port 9
data direction register (P9DDR).
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