C8051F93X-C8051F92X View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

MFG CO.

C8051F93X-C8051F92X

Single/Dual Battery, 0.9–3.6 V, 64/32 kB, SmaRTClock, 10-Bit ADC MCU

Silicon Laboratories 

C8051F93x-C8051F92x

20.1.4. SmaRTClock Interface Autoread Feature

When Autoread is enabled, each read from RTC0DAT initiates the next indirect read operation on the

SmaRTClock internal register selected by RTC0ADR. Software should set the BUSY bit once at the

beginning of each series of consecutive reads. Software should follow recommended instruction timing or

check if the SmaRTClock Interface is busy prior to reading RTC0DAT. Autoread is enabled by setting

AUTORD (RTC0ADR.6) to logic 1.

20.1.5. RTC0ADR Autoincrement Feature

For ease of reading and writing the 32-bit CAPTURE and ALARM values, RTC0ADR automatically

increments after each read or write to a CAPTUREn or ALARMn register. This speeds up the process of

setting an alarm or reading the current SmaRTClock timer value. Autoincrement is always enabled.

Recommended Instruction Timing for a multi-byte register read with short strobe and autoread enabled:

mov RTC0ADR, #0d0h

nop

nop

nop

mov A, RTC0DAT

nop

nop

mov A, RTC0DAT

nop

nop

mov A, RTC0DAT

nop

nop

mov A, RTC0DAT

Recommended Instruction Timing for a multi-byte register write with short strobe enabled:

mov RTC0ADR, #010h

mov RTC0DAT, #05h

nop

mov RTC0DAT, #06h

nop

mov RTC0DAT, #07h

nop

mov RTC0DAT, #08h

nop

Rev. 1.3

203

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