MC68HC812A4 Datasheet, PDF (36/342 Pages) Motorola, Inc – 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus. Modules include

General Description
Table 1-3. Port Descriptions
Port
Direction
Function
Port A
I/O
Single-chip modes: general-purpose I/O
Expanded modes: external address bus ADDR15–ADDR8
Port B
I/O
Single-chip modes: general-purpose I/O
Expanded modes: external address bus ADDR7–ADDR0
Port C
Single-chip modes: general-purpose I/O
I/O
Expanded wide modes: external data bus DATA15–DATA8
Expanded narrow modes: external data bus DATA15–DATA8/DATA7–DATA0
Port D
Single-chip and expanded narrow modes: general-purpose I/O
I/O
External data bus DATA7–DATA0 in expanded wide mode⁽¹⁾
Port E
I/O and I⁽²⁾
External interrupt request inputs, mode select inputs, bus control signals
General-purpose I/O
Port F
I/O
Chip select
General-purpose I/O
Port G
I/O
Memory expansion
General-purpose I/O
Port H
I/O
Key wakeup⁽³⁾
General-purpose I/O
Port J
I/O
Key wakeup⁽⁴⁾
General-purpose I/O
Port S
I/O
SCI and SPI ports
General-purpose I/O
Port T
I/O
Timer port
General-purpose I/O
Port AD
I
ADC port
General-purpose input
1. Key wakeup interrupt request can occur when an input goes from high to low.
2. PE1 and PE0 are input-only pins.
3. Key wakeup interrupt request can occur when an input goes from high to low.
4. Key wakeup interrupt request can occur when an input goes from high to low or from low to high.
MC68HC812A4 — Rev. 3.0
36
General Description
Advance Information
MOTOROLA