MC68HC908GR16 Datasheet, PDF (192/276 Pages) Motorola, Inc – Microcontrollers

System Integration Module (SIM)
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
15.7.1 Break Status Register
The break status register (BSR) contains a flag to indicate that a break caused an exit from wait mode.
This register is only used in emulation mode.
Address: $FE00
Bit 7
6
5
4
3
2
1
Bit 0
Read:
SBSW
R
Write:
R
R
R
R
R
Note⁽¹⁾
R
Reset: 0
0
0
0
0
0
0
0
R
= Reserved
1. Writing a 0 clears SBSW.
Figure 15-21. Break Status Register (BSR)
SBSW — SIM Break Stop/Wait
SBSW can be read within the break state SWI routine. The user can modify the return address on the
stack by subtracting one from it.
1 = Wait mode was exited by break interrupt.
0 = Wait mode was not exited by break interrupt.
MC68HC908GR16 Data Sheet, Rev. 5.0
192
Freescale Semiconductor