C8051F921 View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

C8051F921

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

Silicon Laboratories 

C8051F93x-C8051F92x

Internal Register Definition 20.6. RTC0XCF: SmaRTClock Oscillator Configuration

Bit

7

6

5

4

3

2

1

0

Name AUTOSTP LOADRDY

Type

R/W

R

R

Reset

0

0

0

LOADCAP

R

R/W

0

Varies Varies Varies Varies

SmaRTClock Address = 0x06

Bit

Name

Function

7 AUTOSTP Automatic Load Capacitance Stepping Enable.

Enables/disables automatic load capacitance stepping.

0: Load capacitance stepping disabled.

1: Load capacitance stepping enabled.

6 LOADRDY Load Capacitance Ready Indicator.

Set by hardware when the load capacitance matches the programmed value.

0: Load capacitance is currently stepping.

1: Load capacitance has reached it programmed value.

5:4

Unused Unused.

Read = 00b; Write = Don’t Care.

3:0 LOADCAP Load Capacitance Programmed Value.

Holds the user’s desired value of the load capacitance. See Table 20.2 on

page 207.

Internal Register Definition 20.7. RTC0PIN: SmaRTClock Pin Configuration

Bit

7

6

5

4

3

2

1

0

Name

RTC0PIN

Type

W

Reset

0

1

1

0

0

1

1

1

SmaRTClock Address = 0x07

Bit Name

Function

7:0 RTC0PIN SmaRTClock Pin Configuration.

Writing 0xE7 to this register forces XTAL3 and XTAL4 to be internally shorted for use

with Self Oscillate Mode.

Writing 0x67 returns XTAL3 and XTAL4 to their normal configuration.

214

Rev. 1.3

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