MC68HC05JJ6 Datasheet, PDF (92/216 Pages) Freescale Semiconductor, Inc – General Release Specification Microcontrollers

Parallel Input/Output
7.4.7 PB5/SDO Logic
The PB5/SDO pin can be used as a simple I/O port pin or be controlled
by the SIOP serial interface as shown in Figure 7-10. The operations of
the PB5 pin are summarized in Table 7-3.
SERIAL DATA OUT (SDO)
SERIAL ENABLE (SPE)
V_DD
READ $0005
WRITE $0005
DATA DIRECTION
REGISTER B
R
BIT DDRB5
WRITE $0001
READ $0001
WRITE $0011
RESET
PORT B DATA
REGISTER
BIT PB5
PULLDOWN
REGISTER B
R
BIT PDIB5
PULLDOWN INHIBIT
MASK OPTION
(ENABLE = 0)
Figure 7-10. PB5/SDO Pin I/O Circuit
PB5
SDO
100 µA
PULLDOWN
DEVICE
General Release Specification
92
MC68HC05JJ6/MC68HC05JP6 — Rev. 3.2
Parallel Input/Output
Freescale Semiconductor