EM6821 datasheet(54/68 Pages) EMMICRO

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EM6821

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16. Option Register Memory Map

The values of the option registers are set by initial reset on power up and through write operations only.

Other resets ; as reset from watchdog, reset from input port A, reset from pin RESET, etc. do not change

the options register value.

Name

Add

Hex

Add

Dec.

Reset

Value

Read Bits

Write Bits

Remarks

b'3210

Read / Write Bits

OPTDebIntPA

OPT[3:0]

117

0000

0: NoDebIntPA[0]

1: NoDebIntPA[1]

2: NoDebIntPA[2]

3: NoDebIntPA[3]

Debouncer on port A

for interrupt gen.

Default: debouncer on

OPTIntEdgPA

OPT[7:4]

118

0000

0: IntEdgPA[0]

1: IntEdgPA[1]

2: IntEdgPA[2]

3: IntEdgPA[3]

Interrupt edge select on

port A.

Default: pos. edge

OPTNoPullPA

OPT[11:8]

119

0000

0: NoPullPA[0]

1: NoPullPA[1]

2: NoPullPA[2]

3: NoPullPA[3]

Pull-down selection on

port A

Default: pull-down

OPTNoPdPB

OPT[15:12]

120

0000

0: NoPdPB[0]

1: NoPdPB[1]

2: NoPdPB[2]

3: NoPdPB[3]

Pull-down selection on

port B

Default: pull-down

OPTNchOpDPB

OPT[19:16]

121

0000

0: NchOpDPB[0]

1: NchOpDPB[1]

2: NchOpDPB[2]

3: NchOpDPB[3]

Nch. open drain

output on port B

Default: CMOS output

OPTNchOpDPS

OPT[23:20]

122

0000

0: NchOpDPS[0]

1: NchOpDPS[1]

2: NchOpDPS[2]

3: NchOpDPS[3]

Nch. open drain

output on port serial

Default: CMOS output

OPTFSelPB

OPT[31:28]

123

0000

0: PB1HzOut

1: PB1kHzOut

2: PB32kHzOut

3: InpResSleep

Frequency output on

port B, reset from sleep

mode with port A

OPTInpRSel1

124

0000

0: InpRes1PA[0]

1: InpRes1PA[1]

2: InpRes1PA[2]

3: InpRes1PA[3]

Reset through port A

inputs selection.

Refer to reset part

OPTInpRSel2

125

0000

0: InpRes2PA[0]

1: InpRes2PA[1]

2: InpRes2PA[2]

3: InpRes2PA[3]

Reset through port A

inputs selection.

Refer to reset part

OPTNoPdPS

OPT[35:32]

126

0000

0: NoPdPS[0]

1: NoPdPS[1]

2: NoPdPS[2]

3: NoPdPS[3]

No Pull-down on port SP

Default: pull-down

RegTestEM

127

----

for EM test only;

EM6821 Datasheet(PDF) 54 Page - EM Microelectronic - MARIN SA

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