MC68HC912BL16 Datasheet, PDF (60/128 Pages) Freescale Semiconductor, Inc – 16-Bit Microcontroller

Freescale Semiconductor, Inc.
Table 19 Clock Monitor Time-Outs
Supply
5V +/− 10%
3V +/− 10%
Range
2-20 µS
5-100 µS
10.5 Clock Function Registers
All register addresses shown reflect the reset state. Registers may be mapped to any 2-Kbyte space.
RTICTL — Real-Time Interrupt Control Register
Bit 7
6
5
4
RTIE RSWAI RSBCK
0
RESET:
0
0
0
0
3
RTBYP
0
2
RTR2
0
1
RTR1
0
Bit 0
RTR0
0
$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 whenever 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 P divided by 2¹³,
when bypassed becomes P divided by 4).
RTR2, RTR1, RTR0 — Real-Time Interrupt Rate Select
Read and write anytime.
Rate select for real-time interrupt. The clock used for this module is the E clock.
Table 20 Real-Time Interrupt Rates
RTR2 RTR1 RTR0 Divide E By:
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
OFF
2¹³
2¹⁴
2¹⁵
2¹⁶
2¹⁷
2¹⁸
2¹⁹
Time-Out Period
E = 4.0 MHz
OFF
2.048 ms
4.096 ms
8.196 ms
16.384 ms
32.768 ms
65.536 ms
131.72 ms
Time-Out Period
E = 8.0 MHz
OFF
1.024 ms
2.048 ms
4.096 ms
8.196 ms
16.384 ms
32.768 ms
65.536 ms
MC68HC912BL16
60
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