MC68HC16Z1 Datasheet, PDF (389/500 Pages) Freescale Semiconductor, Inc – M68HC16Z Series

Freescale Semiconductor, Inc.
D.2.15 Software Watchdog Service Register
SWSR — Software Watchdog Service Register¹
$YFFA26
15
RESET:
NOT USED
NOTES:
1. This register is shown with a read value.
8
7
6
5
4
3
2
1
0
SWSR[7:0]
0
0
0
0
0
0
0
0
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
PORTC — Port C Data Register
15
RESET:
NOT USED
$YFFA40
8
7
6
5
4
3
2
1
0
0
PC6 PC5 PC4 PC3 PC2 PC1 PC0
0
1
1
1
1
1
1
1
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
CSPAR0 — Chip-Select Pin Assignment Register 0
15
14
0
0
RESET:
0
0
13
12
CS5PA[1:0]
11
10
CS4PA[1:0]
9
8
CS3PA[1:0]
DATA2 1 DATA2 1 DATA2 1
7
6
CS2PA[1:0]
DATA1 1
5
4
CS1PA[1:0]
DATA1 1
$YFFA44
3
2
CS0PA[1:0]
1
0
CSBTPA[1:0]
DATA1 1
1 DATA0
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.
M68HC16 Z SERIES
USER’S MANUAL
REGISTER SUMMARY
For More Information On This Product,
Go to: www.freescale.com
D-15