参数资料
| 型号： | AS3658F-BCTP |
| 厂商： | ams |
| 文件页数： | 141/158页 |
| 文件大小： | 0K |
| 描述： | IC PMU POWER/AUDIO 124-CTBGA |
| 标准包装： | 2,500 |
| 应用： | 便携式设备 |
| 电流 - 电源： | 7mA |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 124-TFBGA |
| 供应商设备封装： | 124-CTBGA（8x8） |
| 包装： | 带卷 (TR) |
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AS3658
Data Sheet Confidential
- Detailed Description - System Functions
10.9
Real-Time Clock (RTC) Module
The RTC module provides time information to the system. It is implemented as a 6-bit counter that is incremented
every second - with the 32kHz oscillator delivering the necessary accurate time base – and is reset to 0 each time the
counter value is 60. An additional 24-bit minute counter is incriminated each time the 6-bit counter is reset to 0. Both
counters are set to 0 at a power-on-reset. The host controller can set the counter to any value by setting the RTC 1…4
registers.
To prevent ambiguous time information because of the 30-bit value being incremented before all of the 4 registers
have been read or written, a 30-bit parallel shadow register is implemented. Every time a write/read access via the
serial interface occurs the parallel shadow register is updated with the current value of the 30-bit counter. Any write
access to the RTC 1 register will disable the update of the parallel register and set the value of the appropriate byte of
the parallel register. Any subsequent write access to the RTC 4 register will transfer the current value of the 30-bit
parallel register to the RTC 1…4 registers and the update of the parallel register is enabled again. Similarly, any read
access to the RTC 1 register will freeze the current value of the parallel register and submit the appropriate byte to the
host controller via the serial interface. Any subsequent read access to the RTC 4 register will enable the update of the
parallel register again. This mechanism makes sure that the maximum error of the value that is written to or read from
the registers is 1 second.
The startup state after power on reset:RTCSecond=3F, RTCMinute1=FF, RTCMinute2=FF, RTCMinute3=FF
To start the RTC, rtc_mode bits have to be set to a non zero value, and the RTC registers have to be set.
The RTC stops automatically at its highest value (3F,FF,FF,FF) to prevent overrun.
Table 168. RTC Second Register
RTCSecond
Addr:64
These bits represents the actual RTC second register
register is reset at power-on-reset only
Bit
5:0
7:6
Bit Name
RTCSecond
-
Default
00h
-
Access
R/W
reserved
Description
Bits 5:0 of the 6-bit RTC second counter
Table 169. RTC Minute1 Register
RTCMinute1
Addr:65
These bits represents the actual RTC Minute1 register
register is reset at power-on-reset only
Bit
7:0
Bit Name
RTCMinute1
Default
00h
Access
R/W
Description
Bits 7…0 of the 24-bit RTC minute counter
Table 170. RTC Minute2 Register
RTCMinute2
Addr:66
These bits represents the actual RTC Minute2 register
register is reset at power-on-reset only
Bit
7:0
Bit Name
RTCMinute2
Default
00h
Access
R/W
Description
Bits 15:8 of the 24-bit RTC minute counter
Table 171. RTC Minute3 Register
RTCMinute3
Addr:67
These bits represents the actual RTC Minute3 register
register is reset at power-on-reset only
Bit
7:0
Bit Name
RTCMinute3
Default
00h
Access
R/W
Description
Bits 23:16 of the 24-bit RTC minute counter
www.austriamicrosystems.com
Revision 1v13
140 - 157
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