Freescale Semiconductor, Inc.
Clock Functions
Clock Function Registers
Clock monitor time-outs are shown in Table 11-3. The corresponding
EXTALi clock period with an ideal 50% duty cycle is twice this time-out
value.
Table 11-3. Clock Monitor Time-Outs
Supply
Range
5 V +/– 10%
2–20 µS
11.12 Clock Function Registers
All register addresses shown reflect the reset state. Registers may be
mapped to any 2K byte space.
Bit 7
RTIE
0
6
RSWAI
0
5
RSBCK
0
4
Reserved
0
3
RTBYP
0
2
RTR2
0
1
RTR1
0
Bit 0
RTR0
0
RESET:
RTICTL — Real-Time Interrupt Control Register
$0014
RTIE — Real Time Interrupt Enable
Read and write anytime.
0 = Interrupt requests from RTI are disabled.
1 = Interrupt will be requested whenever RTIF is set.
RSWAI — RTI and COP Stop While in Wait
Write once in normal modes, anytime in special modes. Read
anytime.
0 = Allows the RTI and COP to continue running in wait.
1 = Disables both the RTI and COP whenever the part goes into
Wait.
RSBCK — RTI and COP Stop While in Background Debug Mode
Write once in normal modes, anytime in special modes. Read
anytime.
0 = Allows the RTI and COP to continue running while in
background mode.
1 = Disables both the RTI and COP when the part is in background
mode. This is useful for emulation.
MC68HC912DG128 — Rev 3.0
Technical Data
Clock Functions
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