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VR4102 Datasheet(PDF) 335 Page - NEC |
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VR4102 Datasheet(HTML) 335 Page - NEC |
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335 / 701 page  335 CHAPTER 16 RTC (REALTIME CLOCK UNIT) This chapter describes the RTC unit’s operations and register settings. 16.1 GENERAL The RTC unit has a total of four timers, including the following three types. • RTCLong … This is a 24-bit programmable counter that counts down using 32.768-kHz cycles. Cycle interrupts occur for up to 512 seconds. The RTC unit includes two RTCLong timers. • TClockCount … This is a 25-bit programmable counter that counts down using TClock cycles. Cycle interrupts occur for up to 1 to 2 seconds. This counter is used for performance evaluation. • ElapsedTime … This is a 48-bit up counter that counts up using 32.768-kHz cycles. It counts up to 272 years before returning to zero. It includes 48-bit comparators (ECMPHREG, ECMPLREG, and ECMPMREG) and 48-bit alarm time registers (ETIMELREG, ETIMEMREG, and ETIMEHREG) to enable interrupts to occur at specified times. |
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