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DS83C530-QNL Datasheet(PDF) 9 Page - Maxim Integrated Products |
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DS83C530-QNL Datasheet(HTML) 9 Page - Maxim Integrated Products |
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9 / 46 page  DS87C530/DS83C530 EPROM/ROM Microcontrollers with Real-Time Clock 9 of 46 Table 1. Special Function Register Locations (continued) * Functions not present in the 80C52 are in bold. REGISTER BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 ADDRESS TL2 CCh TH2 CDh PSW CY AC F0 RS1 RS0 OV FL P D0h WDCON SMOD_1 POR EPFI PFI WDIF WTRF EWT RWT D8h ACC E0h EIE — — ERTCI EWDI EX5 EX4 EX3 EX2 E8h B F0h RTASS F2h RTAS 0 0 F3h RTAM 0 0 F4h RTAH 0 0 0 F5h EIP — — PRTCI PWDI PX5 PX4 PX3 PX2 F8h RTCC SSCE SCE MCE HCE RTCRE RTCWE RTCIF RTCE F9h RTCSS FAh RTCS 0 0 FBh RTCM 0 0 FCh RTCH FDh RTCD0 FEh RTCD1 FFh NONVOLATILE FUNCTIONS The DS87C530/DS83C530 provide two functions that are permanently powered if a user supplies an external energy source. These are an on-chip RTC and a nonvolatile SRAM. The chip contains all related functions and controls. The user must supply a backup source and a 32.768kHz timekeeping crystal. REAL-TIME CLOCK The on-chip RTC keeps time of day and calendar functions. Its time base is a 32.768kHz crystal between pins RTCX1 and RTCX2. The RTC maintains time to 1/256 of a second. It also allows a user to read (and write) seconds, minutes, hours, day of the week, and date. Figure 2 shows the clock organization. Timekeeping registers allow easy access to commonly needed time values. For example, software can simply check the elapsed number of minutes by reading one register. Alternately, it can read the complete time of day, including subseconds, in only four registers. The calendar stores its data in binary form. While this requires software translation, it allows complete flexibility as to the exact value. A user can start the calendar with a variety of selections since it is simply a 16-bit binary number of days. This number allows a total range of 179 years beginning from 0000. The RTC features a programmable alarm condition. A user selects the alarm time. When the RTC reaches the selected value, it sets a flag. This will cause an interrupt if enabled, even in Stop mode. The alarm consists of a comparator that matches the user value against the RTC actual value. A user can select a match for 1 or more of the sub-seconds, seconds, minutes, or hours. This allows an interrupt |
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