68HC912DG128 Datasheet, PDF (165/424 Pages) Motorola, Inc – Advance Information

Clock Functions
Clock Function Registers
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 24 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
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
OFF
65.536 ms
131.72 ms
263.44 ms
526.88 ms
1.05 s
2.11 s
4.22 s
OFF
16.384 ms
32.768 ms
65.536 ms
131.72 ms
263.44 ms
526.88 ms
1.05 s
OFF
4.096 ms
8.196 ms
16.384 ms
32.768 ms
65.536 ms
131.72 ms
263.44 ms
OFF
1.024 ms
2.048 ms
4.096 ms
8.196 ms
16.384 ms
32.768 ms
65.536 ms
RTIFLG — Real Time Interrupt Flag Register
$0015
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
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.
27-clock
MOTOROLA
Clock Functions
68HC912DG128 Rev 1.0
165