SPMCK16Z4MPV20 datasheet(389/500 Pages) FREESCALE

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M68HC16 Z SERIES

USER’S MANUAL

D-15

D.2.15 Software Watchdog Service Register

This register can be read or written at any time. Bits [15:8] are unimplemented and will

always read zero.

To reset the software watchdog:

1. Write $55 to SWSR.

2. Write $AA to SWSR.

Both writes must occur in the order specified before the software watchdog times out,

but any number of instructions can occur between the two writes.

D.2.16 Port C Data Register

This register latches data for chip-select pins configured as discrete outputs. This reg-

ister can be read or written at any time. Bits [15:8] are unimplemented and will always

read zero.

D.2.17 Chip-Select Pin Assignment Registers

Chip-select pin assignment registers configure the chip-select pins for discrete I/O, an

alternate function, or as an 8-bit or 16-bit chip-select. The possible encodings for each

2-bit field in CSPAR[0:1] (except for CSBTPA[1:0]) are shown in Table D-8.

SWSR — Software Watchdog Service Register1

$YFFA26

NOTES:

1. This register is shown with a read value.

NOT USED

SWSR[7:0]

RESET:

PORTC — Port C Data Register

$YFFA40

NOT USED

PC6

PC5

PC4

PC3

PC2

PC1

PC0

RESET:

CSPAR0 — Chip-Select Pin Assignment Register 0

$YFFA44

CS5PA[1:0]

CS4PA[1:0]

CS3PA[1:0]

CS2PA[1:0]

CS1PA[1:0]

CS0PA[1:0]

CSBTPA[1:0]

RESET:

DATA2

DATA1

DATA0

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