mc68hc916y3 Freescale Semiconductor, Inc, mc68hc916y3 Datasheet - Page 387

• Manufacturer Part Number: mc68hc916y3
• Description: Mc68hc16y3 16 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

D.2.4 Reset Status Register
RSR — Reset Status Register
EXT — External Reset
POW — Power-Up Reset
SW — Software Watchdog Reset
HLT — Halt Monitor Reset
SYS — System Reset
TST — Test Submodule Reset
D.2.5 SCIM Test Register E
SCIMTRE — Single-Chip Integration Module Test Register E
D.2.6 Port A and B Data Registers
PORTA — Port A Data Register
PORTB — Port B Data Register
MC68HC16Y3/916Y3
USER’S MANUAL
PA7
15
15
U
RESET:
RSR contains a status bit for each reset source in the MCU. RSR is updated when the
MCU comes out of reset. A set bit indicates what type of reset occurred. If multiple
sources assert reset signals at the same time, more than one bit in RSR may be set.
This register can be read at any time; a write has no effect. Bits [15:8] are
unimplemented and always read zero.
Reset caused by the RESET pin.
Reset caused by the power-up reset circuit.
Reset caused by the software watchdog circuit.
Reset caused by the halt monitor.
The CPU16 does not support this function. This bit will never be set.
Reset caused by the test submodule. Used during factory test reserved operating
mode only.
Used for factory test only.
Ports A and B are available in single-chip mode only. PORTA and PORTB can be read
or written any time the MCU is not in emulator mode.
PA6
U
PA5
U
PA4
NOT USED
U
PA3
Freescale Semiconductor, Inc.
U
For More Information On This Product,
PA2
U
Go to: www.freescale.com
PA1
REGISTER SUMMARY
U
PA0
U
8
8
EXT
PB7
U
7
7
POW
PB6
6
6
U
PB5
SW
U
5
5
HLT
PB4
U
4
4
PB3
U
3
0
3
SERVED
PB2
RE-
U
2
2
$YFFA0A
$YFFA0B
$YFFA06
$YFFA08
MOTOROLA
PB1
SYS
U
1
1
PB0
TST
U
0
0
D-9