MC68HC908GZ60 Datasheet, PDF (236/352 Pages) Freescale Semiconductor, Inc – Microcontrollers

System Integration Module (SIM)
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 15-19 shows stop mode entry timing. Figure
15-20 shows stop mode recovery time from interrupt.
NOTE
To minimize stop current, all pins configured as inputs should be driven to
a 1 or 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 15-19. 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 15-20. Stop Mode Recovery from Interrupt
15.7 SIM Registers
The SIM has three memory-mapped registers. Table 15-4 shows the mapping of these registers.
Table 15-4. SIM Registers
Address
$FE00
$FE01
$FE03
Register
BSR
SRSR
BFCR
Access Mode
User
User
User
MC68HC908GZ60 • MC68HC908GZ48 • MC68HC908GZ32 Data Sheet, Rev. 6
236
Freescale Semiconductor