mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 92

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

4.2 RESET STATUS REGISTER
The 32-bit reset status register (RSR) is powered by the keep-alive power supply. As shown
in Section 3 Memory Map , it is memory-mapped into the MPC823 system interface unit
register map and receives its default reset values at power-on reset.
EHRS—External Hard Reset Status
This bit is cleared by a power-on reset. When an external hard reset event is detected, this
bit is set and remains that way until the software clears it. The EHRS bit can be negated by
writing a 1, but a write of zero has no effect on it.
ESRS—External Soft Reset Status
This bit is cleared by a power-on reset. When an external soft reset event is detected, this
bit is set and remains that way until the software clears it. The ESRS bit can be negated by
writing a 1, but a write of zero has no effect on it.
LLRS—Loss-of-Lock Reset Status
This bit is cleared by a power-on reset. When a loss-of-lock event is enabled by the LOLRE
bit in the PLPRCR is detected, this bit is set and remains that way until the software clears
it. The LLRS bit can be negated by writing a 1, but a write of zero has no effect on it.
RSR
RESET
RESET
FIELD
FIELD
R/W
R/W
BIT
BIT
0 = No external hard reset event occurred.
1 = An external hard reset event occurred.
0 = No external soft reset event occurred.
1 = An external soft reset event occurred.
0 = No enabled loss-of-lock reset event occurred.
1 = An enabled loss-of-lock reset event occurred.
EHRS
R/W
16
0
1
ESRS
R/W
17
1
1
LLRS
R/W
18
2
0
Freescale Semiconductor, Inc.
SWRS
For More Information On This Product,
R/W
19
3
0
CSRS
R/W
20
MPC823 REFERENCE MANUAL
4
0
Go to: www.freescale.com
DBHRS DBSRS
R/W
21
5
0
R/W
22
6
0
JTRS
R/W
23
7
RESERVED
0
R/W
0
24
8
25
9
10
26
RESERVED
11
27
R/W
0
12
28
13
29
14
30
Reset
15
31
4-5