MC68HC912BL16 Datasheet, PDF (18/128 Pages) Freescale Semiconductor, Inc – 16-Bit Microcontroller

Freescale Semiconductor, Inc.
Table 6 MC68HC912BL16 Port Description Summary
Pin
Data Direction
Port Name Numbers DD Register (Address)
Description
Port A
PA[7:0]
Port B
PB[7:0]
37–30
16–9
In/Out
DDRA ($0002)
In/Out
DDRB ($0003)
Port A and port B pins are used for address and data in ex-
panded modes. The port data registers are not in the address
map during expanded and peripheral mode operation. When
in the map, port A and port B can be read or written any time.
DDRA and DDRB are not in the address map in expanded or
peripheral modes.
Port AD
PAD[7:0]
49–42
In
Analog-to-digital converter and general-purpose I/O.
Port E
PE[7:0]
20–17, 29–26
PE[1:0] In
PE[7:2] In/Out
DDRE ($0009)
Mode selection, bus control signals and interrupt service
request signals; or general-purpose I/O.
Port P
PP[3:0]
61–64
In/Out
DDRP ($0057)
PP[3:0] are use with the pulse-width modulator when en-
abled.
Port S
PS[7:4]
PS[1:0]
57–54, 53-52
In/Out
DDRS ($00D7)
Serial communications interface and serial peripheral in-
terface subsystems and general-purpose I/O.
Port T
PT[7]
PT[5:0]
7, 6–1
In/Out
DDRT ($00AF)
General-purpose I/O when not enabled for input capture and
output compare in the timer and pulse accumulator sub-
system.
MC68HC912BL16
18
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