MC912DG128ACPVE Datasheet, PDF (188/478 Pages) Freescale Semiconductor, Inc – Upward compatible with M68HC11 instruction set

Clock Functions
Freescale Semiconductor, Inc.
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 XCLK.
Table 12-4. Real Time Interrupt Rates
RTR2
0
0
0
0
1
1
1
1
RTR1
0
0
1
1
0
0
1
1
RTR0
Divide X By:
Time-Out Period
X = 125 KHz
Time-Out Period
X = 500 KHz
Time-Out Period
X = 2.0 MHz
Time-Out Period
X = 8.0 MHz
0
OFF
OFF
OFF
OFF
OFF
1
2¹³
65.536 ms
16.384 ms
4.096 ms
1.024 ms
0
2¹⁴
131.72 ms
32.768 ms
8.196 ms
2.048 ms
1
2¹⁵
263.44 ms
65.536 ms
16.384 ms
4.096 ms
0
2¹⁶
526.88 ms
131.72 ms
32.768 ms
8.196 ms
1
2¹⁷
1.05 s
263.44 ms
65.536 ms
16.384 ms
0
2¹⁸
2.11 s
526.88 ms
131.72 ms
32.768 ms
1
2¹⁹
4.22 s
1.05 s
263.44 ms
65.536 ms
Bit 7
6
5
4
3
2
1
Bit 0
RTIF
0
0
0
0
0
0
0
RESET:
0
0
0
0
0
0
0
0
RTIFLG — Real Time Interrupt Flag Register
$0015
RTIF — Real Time Interrupt Flag
This bit is cleared automatically by a write to this register with this bit
set.
0 = Time-out has not yet occurred.
1 = Set when the time-out period is met.
Technical Data
188
MC68HC912DT128A — Rev 4.0
Clock Functions
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