Motorola DragonBall MC9328MX1 Reference Manual page 594

Real-Time Clock (RTC)
Table 23-10. RTC Interrupt Status Register Description (Continued)
Name
SAM2 Sampling Timer Interrupt Flag at SAM2
Bit 10 Frequency—Indicates that an interrupt has occurred. If
enabled, this bit is periodically set at a rate of 16, 15.625, or
18.75 Hz. The actual rate of the interrupt depends on the
input clock value. See Table 23-1.
SAM1 Sampling Timer Interrupt Flag at SAM1
Bit 9 Frequency—Indicates that an interrupt has occurred. If
enabled, this bit is periodically set at a rate of 8, 7.8125, or
9.375 Hz. The actual rate of the interrupt depends on the
input clock value. See Table 23-1.
SAM0 Sampling Timer Interrupt Flag at SAM0
Bit 8 Frequency—Indicates that an interrupt has occurred. If
enabled, this bit is periodically set at a rate of 4, 3.90625, or
4.6875 Hz. The actual rate of the interrupt depends on the
input clock value. See Table 23-1.
2HZ 2 Hz Flag—Indicates that a 2Hz status event has occurred. If
Bit 7 enabled, this bit is set at intervals of every 2 Hz.
Reserved Reserved—This bit is reserved and should read 0.
Bit 6
HR Hour Flag—Indicates that the hour counter has
Bit 5 incremented. If enabled, this bit is set on every increment of
the hour counter in the time-of-day clock.
1HZ 1 Hz Flag—Indicates that the second counter has
Bit 4 incremented. If enabled, this bit is set on every increment of
the second counter of the time-of-day clock.
DAY Day Flag—Indicates that the day counter has incremented.
Bit 3 If enabled, this bit is set on every increment of the day
counter of the time-of-day clock.
ALM Alarm Flag—Indicates that the real-time clock matches the
Bit 2 value in the alarm registers. Note that the alarm will reoccur
every 512 days. For a single alarm, clear the interrupt enable
for this bit in the interrupt service routine.
MIN Minute Flag—Indicates that the minute counter has
Bit 1 incremented. If enabled, this bit is set on every increment of
the minute counter in the time-of-day clock.
SW Stopwatch Flag—Indicates that the stopwatch countdown
Bit 0 timed out.
23-12
Description
MC9328MX1 Reference Manual
Settings
0 = No SAM2 interrupt occurred
1 = A SAM2 interrupt occurred
0 = No SAM1 interrupt occurred
1 = A SAM1 interrupt occurred
0 = No SAM0 interrupt occurred
1 = A SAM0 interrupt occurred
0 = No 2 Hz event occurred
1 = A 2 Hz interval event occurred
0 = No 1-hour interrupt occurred
1 = A 1-hour interrupt occurred
0 = No 1 Hz interrupt occurred
1 = A 1 Hz interrupt occurred
0 = No 24-hour rollover interrupt
occurred
1 = A 24-hour rollover interrupt
occurred
0 = No alarm interrupt occurred
1 = An alarm interrupt occurred
0 = No 1-minute interrupt occurred
1 = A 1-minute interrupt occurred
0 = The stopwatch did not time-out.
1 = The stopwatch timed out.
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