NXP Semiconductors MC9S08SU16 Reference Manual page 109

Field
00 COP is disabled.
5
01 2 (LPOCLK/ICSIRCLK) or 2
8
10 2 (LPOCLK/ICSIRCLK) or 2
10
01 2
5–4 COP Clock Source Select
COPCLKS
These write-once bits selects the COP clock source.
00 COP logic runs from independent on-chip LPO clock source.
01 COP logic runs from system bus clock.
10 COP logic runs from ICSIRCLK.
11 COP logic runs from pin CLK_IN.
3 COP Window Mode Enable
COPW
This write-once bit specifies whether the COP operates in Normal or Window mode. In Window mode, the
0x55-0xAA write sequence to the SRS register must occur within the last 25% of the selected period; any
write to the SRS register during the first 75% of the selected period resets the microcontroller.
0 Normal mode.
1 Window mode.
2 Frequency Range Select
RANGE
This write-once bit work with ICS_C1[RDIV] to divide external reference clock to 31.25―39.0625 kHz..
0 Low frequency range of external clock(31.25 kHz―1 MHz).
1 High frequency range of external clock(1 MHz―40 MHz).
1 Fast Wakeup Enable
FWAKE
This write once bit can set CPU wakeup without any interrupt subroutine serviced. This action saved more
than 11 cycles(whole interrupt subroutine time). After wake up CPU continue the address before wait or
stop.
NOTE: When FWAKE is set, user should avoid generating interrupt 0~8 bus clock cycles after issuing
0 CPU wakes up as normal.
1 CPU wakes up without any interrupt subroutine serviced.
0 Stop Mode Enable
STOPE
This write-once bit defaults to 0 after reset, which disables stop mode. If stop mode is disabled and a user
program attempts to execute a STOP instruction, an illegal opcode reset occurs.
0 Stop mode disabled.
1 Stop mode enabled.
NXP Semiconductors
SIM_SOPT1 field descriptions (continued)
13
(BUSCLK/CLK_IN) cycles.
16
(BUSCLK/CLK_IN) cycles.
18
(LPOCLK/ICSIRCLK) or 2
the stop instruction, or the MCU may stuck at Stop mode and cannot wake up by interrupts.
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
Chapter 9 System Integration Module (SIM)
Description
(BUSCLK/CLK_IN) cycles
109