MC68HC05JJ6 Datasheet, PDF (96/216 Pages) Freescale Semiconductor, Inc – General Release Specification Microcontrollers

Parallel Input/Output
7.4.9 PB7/SCK Logic
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)
READ $0005
CLOCK SOURCE (MSTR)
SERIAL ENABLE (SPE)
WRITE $0005
DATA DIRECTION
REGISTER B
BIT DDRB7
R
WRITE $0001
READ $0001
WRITE $0011
RESET
PORT B DATA
REGISTER
BIT PB7
PULLDOWN
REGISTER B
R
BIT PDIB7
PULLDOWN INHIBIT
MASK OPTION
(ENABLE = 0)
Figure 7-12. PB7/SCK Pin I/O Circuit
PB7
SCK
100 µA
PULLDOWN
DEVICE
General Release Specification
96
MC68HC05JJ6/MC68HC05JP6 — Rev. 3.2
Parallel Input/Output
Freescale Semiconductor