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FN6659 Datasheet(PDF) 13 Page - Renesas Technology Corp |
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FN6659 Datasheet(HTML) 13 Page - Renesas Technology Corp |
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13 / 32 page  ISL12022 FN6659 Rev.3.01 Page 13 of 32 Oct 24, 2019 Register Descriptions The battery-backed registers are accessible following a slave byte of “1101111x” and reads or writes to addresses [00h:2Fh]. The defined addresses and default values are described in the Table 1. The battery backed general purpose SRAM has a different slave address (1010111x), so it is not possible to read/write that section of memory while accessing the registers. REGISTER ACCESS The contents of the registers can be modified by performing a byte or a page write operation directly to any register address. The registers are divided into 8 sections. They are: 1. Real Time Clock (7 bytes): Address 00h to 06h. 2. Control and Status (9 bytes): Address 07h to 0Fh. 3. Alarm (6 bytes): Address 10h to 15h. 4. Time Stamp for Battery Status (5 bytes): Address 16h to 1Ah. 5. Time Stamp for VDD Status (5 bytes): Address 1Bh to 1Fh. 6. Daylight Savings Time (8 bytes): 20h to 27h. 7. TEMP (2 bytes): 28h to 29h 8. Crystal Net PPM Correction, NPPM (2 bytes): 2Ah, 2Bh 9. Crystal Turnover Temperature, XT0 (1 byte): 2Ch 10. Crystal ALPHA at high temperature, ALPHA_H (1 byte): 2Dh 11. Scratch Pad (2 bytes): Address 2Eh and 2Fh Write capability is allowable into the RTC registers (00h to 06h) only when the WRTC bit (bit 6 of address 08h) is set to “1”. A multi-byte read or write operation should be limited to one section per operation for best RTC time keeping performance. A register can be read by performing a random read at any address at any time. This returns the contents of that register location. Additional registers are read by performing a sequential read. For the RTC and Alarm registers, the read instruction latches all clock registers into a buffer, so an update of the clock does not change the time being read. At the end of a read, the master supplies a stop condition to end the operation and free the bus. After a read, the address remains at the previous address +1 so the user can execute a current address read and continue reading the next register. When the previous address is 2Fh, the next address will wrap around to 00h. It is not necessary to set the WRTC bit prior to writing into the control and status, alarm, and user SRAM registers. TABLE 1. REGISTER MEMORY MAP ADDR. SECTION REG NAME BIT RANGE DEFAULT 7 6 543 2 1 0 00h RTC SC 0 SC22 SC21 SC20 SC13 SC12 SC11 SC10 0 to 59 00h 01h MN 0 MN22 MN21 MN20 MN13 MN12 MN11 MN10 0 to 59 00h 02h HR MIL 0 HR21 HR20 HR13 HR12 HR11 HR10 0 to 23 00h 03h DT 0 0 DT21 DT20 DT13 DT12 DT11 DT10 1 to 31 01h 04h MO 0 0 0 MO20 MO13 MO12 MO11 MO10 1 to 12 01h 05h YR YR23 YR22 YR21 YR20 YR13 YR12 YR11 YR10 0 to 99 00h 06h DW 0 0 0 0 0 DW2 DW1 DW0 0 to 6 00h 07h CSR SR BUSY OSCF DSTADJ ALM LVDD LBAT85 LBAT75 RTCF N/A 01h 08h INT ARST WRTC IM FOBATB FO3 FO2 FO1 FO0 N/A 01h 09h PWR_VDD CLRTS D D D D VDDTrip2 VDDTrip1 VDDTrip0 N/A 00h 0Ah PWR_VBAT RESEALB VB85Tp2 VB85Tp1 VB85Tp0 VB75Tp2 VB75Tp1 VB75Tp0 N/A 00h 0Bh ITRO IDTR01 IDTR00 IATR05 IATR04 IATR03 IATR02 IATR01 IATR00 N/A 20h 0Ch ALPHA D ALPHA6 ALPHA5 ALPHA4 ALPHA3 ALPHA2 ALPHA1 ALPHA0 N/A 46h 0Dh BETA TSE BTSE BTSR BETA4 BETA3 BETA2 BETA1 BETA0 N/A 00h 0Eh FATR 0 0 FFATR5 FATR4 FATR3 FATR2 FATR1 FATR0 N/A 00h 0Fh FDTR 0 0 0 FDTR4 FDTR3 FDTR2 FDTR1 FDTR0 N/A 00h 10h ALARM SCA0 ESCA0 SCA022 SCA021 SCA020 SCA013 SCA012 SCA011 SCA010 00 to 59 00h 11h MNA0 EMNA0 MNA022 MNA021 MNA020 MNA013 MNA012 MNA011 MNA010 00 to 59 00h 12h HRA0 EHRA0 D HRA021 HRA020 HRA013 HRA012 HRA011 HRA010 0 to 23 00h 13h DTA0 EDTA0 D DTA021 DTA020 DTA013 DTA012 DTA011 DTA010 01 to 31 00h 14h MOA0 EMOA00 D D MOA020 MOA013 MOA012 MOA011 MOA010 01 to 12 00h 15h DWA0 EDWA0 D D D D DWA02 DWA01 DWA00 0 to 6 00h |
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