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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT95C30P 데이터시트(PDF) 27 Page - Holtek Semiconductor Inc |
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HT95C30P 데이터시트(HTML) 27 Page - Holtek Semiconductor Inc |
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27 / 52 page  HT95LXXX Rev. 1.20 27 May 26, 2004 Line Control Function (Supported for HT95L400/40P, HT95L300/30P, HT95L200/20P, HT95L100/10P) Register Label Bits R/W Function LINE (22H) ¾ 6~0 RO Unused bit, read as ²0² LINEC 7 RW 1: Enable the line control function 0: Disable the line control function The line control function is enabled by flag LINEC Conditions Source to Enable Line Control Function LINEC Operation Mode 1 Normal or Green mode RTC time out interrupt 1 Sleep mode Port A wake-up RTC time out interrupt 1 Idle mode Port A wake-up When the line control source is activated, the PO pin will be set to high signal. Clearing LINEC to 0 will terminate the line control function and drive PO pin outputs low signal. RTC Function Register Label Bits R/W Function RTCC (24H) ¾ 6, 4~0 RO Unused bit, read as ²0² RTCEN 5 RW 1: Enable RTC function 0: Disable RTC function RTCTO 7 RW 1: RTC time-out occurs 0: RTC time-out not occurs L i n e C o n t r o l C i r c u i t R T C I n t e r r u p t P o r t A W a k e - u p F u n c t i o n L I N E C = 1 P O = 1 The real time clock (RTC) is used to supply a regular in- ternal interrupt. Its time-out period is 1000ms. If the RTC time-out occurs, the interrupt request flag RTCF and the RTCTO flag will be set to 1. The interrupt vector for the RTC is 14H. When the interrupt subroutine is serviced, the interrupt request flag (RTCF) will be cleared to 0, but the flag RTCTO remain in its original value. If the RTCTO flag is not cleared, next RTC time-out interrupt will occur. Low Battery Detection (Supported for HT95L400/40P, HT95L300/30P, HT95L200/20P, HT95L100/10P) The phone controller provides a circuit that detects the LBIN pin voltage level. To enable this detection func- tion, the LBEN should be written as 1. Once this function is enabled, the detection circuit needs 50 ms to be stable. After that, the user could read the result from LBFG. The low battery detect function will consume power. For power saving, write 0 to LBEN if the low battery detec- tion function is unnecessary. V D E T L B I N L B F G 1 . 1 5 V R e f e r e n c e V o l t a g e L B E N R 1 R 2 The battery low threshold is determined by external R1 and R2 resistors. 1.15= VxR2 R1+ R2 DET ® VDET= 1.15x(R1+ R2) R2 If we want to detect VDET=2.4V then 2.4V= 1.15x(R1+ R2) R2 ® R1=1.087R2 |
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