MC68HC908AB32 MOTOROLA [Motorola, Inc], MC68HC908AB32 Datasheet - Page 128
MC68HC908AB32
Manufacturer Part Number
MC68HC908AB32
Description
HCMOS Microcontroller Unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AB32.pdf
(392 pages)
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System Integration Module (SIM)
8.8.2 SIM Reset Status Register
Technical Data
128
;
;
;
;
This code works if the H register has been pushed onto the stack in the break
service routine software. This code should be executed at the end of the
break service routine software.
HIBYTE
LOBYTE
DOLO
RETURN
EQU
EQU
If not SBSW, do RTI
BRCLR
TST
BNE
DEC
DEC
PULH
RTI
Address:
This register contains six flags that show the source of the last reset. The
SIM reset status register can be cleared by reading it. A power-on reset
sets the POR bit and clears all other bits in the register.
POR — Power-On Reset Bit
Reset:
Read:
Write:
Freescale Semiconductor, Inc.
5
6
SBSW,SBSR, RETURN ;
LOBYTE,SP
DOLO
HIBYTE,SP
LOBYTE,SP
For More Information On This Product,
1 = Last reset caused by POR circuit
0 = Read of SRSR
$FE01
POR
Bit 7
1
Figure 8-18. SIM Reset Status Register (SRSR)
System Integration Module (SIM)
Go to: www.freescale.com
= Unimplemented
PIN
6
0
;
; If RETURNLO is not 0,
; then just decrement low byte.
; Else deal with high byte, too.
; Point to STOP/WAIT opcode.
; Restore H register.
COP
See if STOP or WAIT mode was exited by
break.
5
0
ILOP
4
0
ILAD
3
0
MC68HC908AB32
2
0
0
LVI
1
0
MOTOROLA
—
Rev. 1.0
Bit 0
0
0
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