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AS3658F-BCTP Datasheet(PDF) 141 Page - ams AG |
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AS3658F-BCTP Datasheet(HTML) 141 Page - ams AG |
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141 / 158 page  www.austriamicrosystems.com Revision 1v13 140 - 157 AS3658 Data Sheet Confidential - Deta il ed Descri ption - System Functi ons 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 Addr:64 RTCSecond These bits represents the actual RTC second register register is reset at power-on-reset only Bit Bit Name Default Access Description Table 169. RTC Minute1 Register Addr:65 RTCMinute1 These bits represents the actual RTC Minute1 register register is reset at power-on-reset only Bit Bit Name Default Access Description Table 170. RTC Minute2 Register Addr:66 RTCMinute2 These bits represents the actual RTC Minute2 register register is reset at power-on-reset only Bit Bit Name Default Access Description Table 171. RTC Minute3 Register Addr:67 RTCMinute3 These bits represents the actual RTC Minute3 register register is reset at power-on-reset only Bit Bit Name Default Access Description 5:0 RTCSecond 00h R/W Bits 5:0 of the 6-bit RTC second counter 7:6 - - reserved 7:0 RTCMinute1 00h R/W Bits 7…0 of the 24-bit RTC minute counter 7:0 RTCMinute2 00h R/W Bits 15:8 of the 24-bit RTC minute counter 7:0 RTCMinute3 00h R/W Bits 23:16 of the 24-bit RTC minute counter |
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