Datasheet

Clock Functions
Clock Function Registers
MC68HC912DT128A — Rev 4.0 Technical Data
MOTOROLA Clock Functions 187
12.12 Clock Function Registers
All register addresses shown reflect the reset state. Registers may be
mapped to any 2K byte space.
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.
RTBYP — Real Time Interrupt Divider Chain Bypass
Write not allowed in normal modes, anytime in special modes. Read
anytime.
0 = Divider chain functions normally.
1 = Divider chain is bypassed, allows faster testing (the divider
chain is normally XCLK divided by 2
13
, when bypassed
becomes XCLK divided by 4).
Bit 7654321Bit 0
RTIE RSWAI RSBCK
Reserved RTBYP RTR2 RTR1 RTR0
RESET: 00000000
RTICTL — Real-Time Interrupt Control Register $0014
Frees
cale Semiconductor,
I
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