MC68HC908GP32_08 Datasheet, PDF (171/266 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

SIM Registers
The SIM counter is held in reset from the execution of the STOP instruction until the beginning of stop
recovery. It is then used to time the recovery period. Figure 14-18 shows stop mode entry timing.
NOTE
To minimize stop current, all pins configured as inputs should be driven to
a logic 1 or logic 0.
CPUSTOP
IAB
STOP ADDR
STOP ADDR + 1
SAME
SAME
IDB
PREVIOUS DATA NEXT OPCODE
SAME
SAME
R/W
Note : Previous data can be operand data or the STOP opcode, depending
on the last instruction.
Figure 14-18. Stop Mode Entry Timing
CGMXCLK
STOP RECOVERY PERIOD
INT/BREAK
IAB
STOP +1
STOP + 2 STOP + 2
SP
SP – 1
SP – 2
SP – 3
Figure 14-19. Stop Mode Recovery from Interrupt or Break
14.7 SIM Registers
The SIM has three memory-mapped registers. Table 14-4 shows the mapping of these registers.
Table 14-4. SIM Registers
Address
$FE00
$FE01
$FE03
Register
SBSR
SRSR
SBFCR
Access Mode
User
User
User
MC68HC908GP32 Data Sheet, Rev. 10
Freescale Semiconductor
171