Freescale Semiconductor, Inc.
Pa ra lle l Inp ut/ Outp ut
7.4.9 PB7/ SCK Log ic
The PB7/SCK pin can be used as a simple I/O port pin or be controlled
by the SIOP serial interface as shown in Figure 7-12. The operations of
the PB7/SCK pin are summarized in Table 7-3.
SERIAL DATA CLOCK (SCK)
CLOCK SOURCE (MSTR)
SERIAL ENABLE (SPE)
READ $0005
WRITE $0005
DATA DIRECTION
REGISTER B
BIT DDRB7
R
PORT B DATA
PB7
SCK
WRITE $0001
REGISTER
BIT PB7
READ $0001
WRITE $0011
PULLDOWN
PULLDOWN
REGISTER B
DEVICE
BIT PDIB7
R
RESET
MASK OPTION REGISTER ($1FF1)
Figure 7-12. PB7/SCK Pin I/O Circuit
General Release Specification
MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0
Parallel Input/Output
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