EM6821 datasheet(52/68 Pages) EMMICRO

52 / 68 page

EM6821

www.emmicroelectronic.com

Name

Add

Hex

Add

Dec.

Reset

Value

Read Bits

Write Bits

Remarks

b'3210

Read / Write Bits

RegMSCCntl2

0000

0: FlSec

1: IntSel

2: PA3Edge

3: DebFreqSel

0: --

1: IntSel

2: PA3Edge

3: DebFreqSel

Millisecond counter control

1 sec flag, Interrupt

and PA3 edge select

RegMSCDataL

0000

0: BCD[0]

1: BCD[1]

2: BCD[2]

3: BCD[3]

0: -

1: -

2: -

3: -

Millisecond counter;

binary coded decimal value, low

nibble

RegMSCDataM

0000

0: BCD[4]

1: BCD[5]

2: BCD[6]

3: BCD[7]

0: -

1: -

2: -

3: -

Millisecond counter;

binary coded decimal value,

middle nibble

RegMSCDataH

100

0000

0: BCD[8]

1: BCD[9]

2: BCD[10]

3: BCD[11]

0: -

1: -

2: -

3: -

Millisecond counter;

binary coded decimal value,

high nibble

RegIRQMask1

101

0000

0: MaskIRQPA[0]

1: MaskIRQPA[1]

2: MaskIRQPA[2]

3: MaskIRQPA[3]

Port A interrupt mask;

masking active 0

RegIRQMask2

102

0000

0: MaskIRQBz

1: MaskIRQBlink

2: MaskIRQHz32/8

3: MaskIRQHz1

Buzzer and prescaler interrupt

mask;

masking active low

RegIRQMask3

103

0000

0: MaskIRQCntComp

1: MaskIRQCount0

2: MaskIRQMSC

3: MaskIRQSerial

10-bit counter, millisecond

counter, serial interrupt mask

masking active low

RegIRQ1

104

0000

0: IRQPA[0]

1: IRQPA[1]

2: IRQPA[2]

3:IRQPA[3]

0:RIRQPA[0]

1:RIRQPA[1]

2:RIRQPA[2]

3:RIRQPA[3]

Read: port A interrupt

Write: Reset IRQ if data bit = 1.

REgIRQ2

105

0000

0: IRQBz

1: IRQBlink

2: IRQHz32/8

3: IRQHz1

0:RIRQBz

1:RIRQBlink

2:RIRQHz32/8

3:RIRQHz1

Read: buzzer and prescaler IRQ

;

Write: Reset IRQ id data bit = 1

RegIRQ3

106

0000

0:IRQCntComp

1: IRQCount0

2: IRQMSC

3: IRQSerial

0:RIRQCntComp

1:RIRQCount0

2:RIRQMSC

3:RIRQSerial

Read: 10-bit counter,

millisecond counter, serial

interrupt

Write: Reset IRQ if data bit =1.

RegSysCntl1

107

0000

0: ChTmDis

1: SelIntFull

2: '0'

3: IntEn

0: ChTmDis

1: SelIntFull

2: Sleep

3: IntEn

System control 1

ChTmDis only usable only for

EM test modes with Test=1

RegSysCntl2

108

0p00

p = POR

0: WDVal0

1: WDVal1

2: SleepEn

3: '0'

0: --

1: --

2: SleepEn

3: WDReset

System control 2;

watchdog value and periodical

reset, enable sleep mode

RegPresc

109

0000

0: DebSel

1: PrIntSel

2: '0'

3: PWMOn

0: DebSel

1: PrIntSel

2: ResPresc

3: PWMOn

Prescaler control;

debouncer and prescaler

interrupt select

IXLow

110

xxxx

0: IXLow[0]

1: IXLow[1]

2: IXLow[2]

3: IXLow[3]

Internal µP index

for µP indexed addressing

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