MC9S08JM16CGTE FREESCALE [Freescale Semiconductor, Inc], MC9S08JM16CGTE Datasheet - Page 215

• Manufacturer Part Number: MC9S08JM16CGTE
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

RTCPS and the RTCLKS[0] bit select the desired divide-by value. If a different value is written to RTCPS,
the prescaler and RTCCNT counters are reset to 0x00.
The RTC modulo register (
When the counter is active, the counter increments at the selected rate until the count matches the modulo
value. When these values match, the counter resets to 0x00 and continues counting. The real-time interrupt
flag (RTIF) is set when a match occurs. The flag sets on the transition from the modulo value to 0x00.
Writing to
The RTC allows for an interrupt to be generated when RTIF is set. To enable the real-time interrupt, set
the real-time interrupt enable bit (RTIE) in
13.4.1
This section shows an example of the RTC operation as the counter reaches a matching value from the
modulo register.
Freescale Semiconductor
RTCPS
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
RTC
RTC Operation Example
MOD resets the prescaler and the RTCCNT counters to 0x00.
1 kHz Internal Clock
(RTCLKS = 00)
128 ms
256 ms
512 ms
1.024 s
32 ms
64 ms
10 ms
16 ms
8 ms
1 ms
2 ms
4 ms
0.1 s
0.5 s
Off
1 s
RTC
MOD) allows the compare value to be set to any value from 0x00 to 0xFF.
MC9S08JM16 Series Data Sheet, Rev. 2
1 MHz External Clock
Table 13-6. Prescaler Period
(RTCLKS = 01)
1.024 ms
2.048 ms
4.096 ms
8.192 ms
RTC
16.4 ms
32.8 ms
65.5 ms
10 ms
20 ms
50 ms
1 ms
2 ms
5 ms
0.1 s
0.2 s
Off
SC. RTIF is cleared by writing a 1 to RTIF.
Table 13-6
32 kHz Internal Clock
(RTCLKS = 10)
15.625 ms
3.125 ms
31.25 ms
31.25 μs
312.5 μs
62.5 μs
250 μs
125 μs
0.5 ms
16 ms
32 ms
shows different prescaler period values.
1 ms
2 ms
4 ms
8 ms
Off
32 kHz Internal Clock
Real-Time Counter (S08RTCV1)
(RTCLKS = 11)
156.25 ms
31.25 ms
312.5 ms
1.5625 s
62.5 ms
128 ms
256 ms
512 ms
1.024 s
2.048 s
0.625 s
3.125 s
32 ms
64 ms
6.25 s
Off
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