FS970X datasheet(33/46 Pages) FORTUNE

33 / 46 page

FS970X

Rev. 4.4

33/46

13. Microprocessor interface

970x can directly connect to any microprocessor by CS_. WR_. RD_. ALE. AD3. AD2. AD1. AD0, and IRQO

pins. It can also control read / write functions of registers, and handle interrupt.

Control register

The control registers are all 8-bit register, input-output port and for microprocessor to read and write. And the

control register will be reset to the initial value of 0 when connecting to the RST_ pin of the chip.

The primary function of the control register is to provide the microprocessor to write to the control setting of the

chip. Hence, it controls all the action of the chip. It can also read the value and for the use of detection.

AFT<7:0>

SCP<7:0>

SIN<7:0>

SRF<7:0>

RGD<7:0>

CPN<1>

MSB

ENSCHMT

EXTD

CAPM

CMPEN1

LSB

BPFTR

SINL<2:0>

SRFH<1:0>

SRFL<2:0>

SOSR<1:0>

SCMPL<1:0>

SCMPH<3:0>

RANGE<3:0>

SINH<3:0>

MODE<3:0>

CPN<0>

Name

Address

ADG<7:0>

ENAD

SETADC

MISC1<7:0>

TPS2<1:0>

ENVDS

MISC2<7:0>

FQRST_

PKHRST_

TPS1<1:0>

Block

ADC

ENVCS

MISC

RCTEN

ACDIV

ACEN

FTR

DTON

CYS<1:0>

INT

INTRG<7:0>

INSTA<3:0>

INTEN<3:0>

ADG<5:0>

ENXTL_

ENOSCO_

TBDIV

FSDIV

ENBP

ENLBS

ENGNDR_

CNTBP

LBO

CMP1

BPACBF

ENCP_

CMPEN2

CPVR

CMP2

Chart 18

. The corresponding address table of all control and interrupt register of the chip.

There are, in total, nine (9) 00~08 addresses of control line or register; as shown in Chart 18. The functions of

each address are briefly illustrated in the Chart 19.

Function

Reference

RGD<7>0>

Controls the on/off status of the measurement mode and decay

network of function network

As described in

Section 7.1

SIN<7:0>

Controls the path and the pre-filter of signal input amplifier of ADC Chart 9 and Chart 10

SRF<5:0>

Controls the path and the pre-filter of reference voltage of ADC

Chart 11 and Chart

SRF<7:6>

Output option of Ω power supply

Chart 8

SCP<7:0>

Controls the path & enable control of the multiplexers at the

front-end of comparator

Chart 13 and Chart

AFT<7:0>

The enable control of on/off status & operation amplifier in some

function networks

Graph 5

AFT<3>

When ENSCHMT = 1, the Schmidt trigger function of enable

comparator

Section 7.5

ADG<5:0>

The gain setting of ADC input

Section 8.3

FS970X データシート(PDF) 33 Page - Fortune Semiconductor Corp.

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