ez80l92 ZiLOG Semiconductor, ez80l92 Datasheet - Page 108

• Manufacturer Part Number: ez80l92
• Description: Ez80acclaim Flash Microcontrollers
• Manufacturer: ZiLOG Semiconductor

PS013014-0107
Real Time Clock Alarm Control Register
This register contains alarm enable bits for the real-time clock. The RTC_ACTRL register
is cleared by a RESET. See
Table 50. Real Time Clock Alarm Control Register (RTC_ACTRL = 00ECh)
Real-Time Clock Control Register
This register contains control and status bits for the real-time clock. Some bits in the
RTC_CTRL register are cleared by a RESET. The ALARM flag and associated interrupt
(if INT_EN is enabled) are cleared by reading this register. The ALARM flag is updated
by clearing (locking) RTC_UNLOCK or by an increment of the RTC count. Writing to the
RTC_CTRL register also resets the RTC count prescaler allowing the RTC to be synchro-
nized to another time source.
SLP_WAKE indicates if an RTC alarm condition initiated the CPU recovery from SLEEP
mode. This bit can be checked after RESET to determine if a sleep-mode recovery is
caused by the RTC. SLP_WAKE is cleared by a Read of the RTC_CTRL register.
Setting BCD_EN causes the RTC to use BCD counting in all registers including the alarm
set points.
Bit
Reset
CPU Access
Note: X = Unchanged by RESET; R = Read-only; R/W = Read/Write.
Bit
Position
[7:4]
3
ADOW_EN
2
AHRS_EN
1
AMIN_EN
0
ASEC_EN
Value Description
0000
0
1
0
1
0
1
0
1
R
Table
Reserved.
The day-of-the-week alarm is disabled.
The day-of-the-week alarm is enabled.
The hours alarm is disabled.
The hours alarm is enabled.
The minutes alarm is disabled.
The minutes alarm is enabled.
The seconds alarm is disabled.
The seconds alarm is enabled.
7
0
50.
R
6
0
R
5
0
R
4
0
R/W
3
0
Product Specification
R/W
2
0
Real Time Clock
R/W
1
0
R/W
0
0
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