Datasheet

Clock Functions
Clock Function Registers
MC68HC912D60A — Rev. 3.1 Technical Data
Freescale Semiconductor Clock Functions 169
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.
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.
Table 11-4. Real Time Interrupt Rates
RTR2 RTR1 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 0 0 OFF OFF OFF OFF OFF
001
2
13
65.536 ms 16.384 ms 4.096 ms 1.024 ms
010
2
14
131.72 ms 32.768 ms 8.196 ms 2.048 ms
011
2
15
263.44 ms 65.536 ms 16.384 ms 4.096 ms
100
2
16
526.88 ms 131.72 ms 32.768 ms 8.196 ms
101
2
17
1.05 s 263.44 ms 65.536 ms 16.384 ms
110
2
18
2.11 s 526.88 ms 131.72 ms 32.768 ms
111
2
19
4.22 s 1.05 s 263.44 ms 65.536 ms
Bit 7654321Bit 0
RTIF0000000
RESET: 00000000
RTIFLG — Real Time Interrupt Flag Register $0015