MC68HC08AZ16 Datasheet, PDF (344/527 Pages) Motorola, Inc – HCMOS Microcontroller Unit

I/O Ports
Port G
When bit DDRGx is a logic one, reading address $000A reads the PTGx
data latch. When bit DDRGx is a logic zero, reading address $000A
reads the voltage level on the pin. The data latch can always be written,
regardless of the state of its data.
23-io
MOTOROLA
I/O Ports
MC68HC08AZ32
343