EZ80L92MCU Datasheet, PDF (118/241 Pages) Zilog, Inc. – eZ80Acclaim Flash Microcontrollers

eZ80L92 MCU
Product Specification
103
Table 51. Real-Time Clock Control Register (RTC_CTRL = 00EDh)
Bit
7
6
5
4
3
2
Reset
X
0
X
X
X
X
CPU Access
R R/W R/W R/W R/W R
Note: X = Unchanged by RESET; R = Read-only; R/W = Read/Write.
1
0
0/1
0
R R/W
Bit
Position
Value Description
7
ALARM
0
Alarm interrupt is inactive.
1
Alarm interrupt is active.
6
INT_EN
0
Interrupt on alarm condition is disabled.
1
Interrupt on alarm condition is enabled.
5
BCD_EN
0
RTC count and alarm value registers are binary.
1
RTC count and alarm value registers are binary-coded
decimal (BCD).
4
CLK_SEL
0
RTC clock source is crystal oscillator output (32768 Hz).
On-chip 32768Hz oscillator is enabled.
1
RTC clock source is power-line frequency input.
On-chip 32768 Hz oscillator is disabled.
3
0
FREQ_SEL
1
Power-line frequency is 60 Hz.
Power-line frequency is 50 Hz.
2
0
Reserved.
1
0
SLP_WAKE ₁
RTC does not generate a Sleep-Mode Recovery reset.
RTC Alarm generates a Sleep-Mode Recovery reset.
0
0
RTC_UNLOCK
RTC count registers are locked to prevent write access.
RTC counter is enabled.
1
RTC count registers are unlocked to allow write access.
RTC counter is disabled.
PS013012-1004
PRELIMINARY
Real-Time Clock