RS5C348A_95 Просмотр технического описания (PDF) - RICOH Co.,Ltd.

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RS5C348A_95

4-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICS WITH VOLTAGE MONITORING FUNCTION

RICOH Co.,Ltd. 

R×5C348A/B

2.2 Control Register 2 (at Address Fh)

D7

VDSL

VDSL

0

D6

D5

D4

D3

D2

VDET SCRATCH1 XSTP CLEN1*2 CTFG

VDET SCRATCH1 XSTP CLEN1*2 CTFG

0

0

1

0

0

D1

WAFG

WAFG

0

D0

DAFG

DAFG

0

(For write operation)

(For read operation)

Default setting*1

*1) Default settings: Default value means read/written values when the XSTP bit is set to “1” due to power-on from 0 volts or supply voltage drop.

*2) This bit name applies to the R×5C348A only. For the R×5C348B the bit name is Scratch2.

2.2-1 VDSL

Supply Voltage Monitoring Threshold Selection Bit

VDSL

0

1

Description

Selecting the supply voltage monitoring threshold setting of 2.1 volts.

Selecting the supply voltage monitoring threshold setting of 1.6 volts.

The VDSL bit is intended to select the supply voltage monitoring threshold settings.

(Default setting)

2.2-2 VDET

Supply Voltage Monitoring Result Indication Bit

VDET

0

1

Description

Indicating supply voltage above the supply voltage monitoring threshold settings.

Indicating supply voltage below the supply voltage monitoring threshold settings.

(Default setting)

Once the VDET bit is set to 1, the supply voltage monitoring circuit will be disabled while the VDET bit will hold the

setting of 1. The VDET bit accepts only the writing of 0, which restarts the supply voltage monitoring circuit.

Conversely, setting the VDET bit to 1 causes no event.

2.2-3 SCRATCH1

Scratch Bit 1

SCRATCH1

0

1

Description

(default settings)

The SCRATCH1 bit is intended for scratching and accepts the reading and writing of 0 and 1. The SCRATCH1 bit

will be set to 0 when the XSTP bit is set to 1 in the control register 2.

14

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