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V1.2.2

CMS32L051 User Manual |Chapter 2 Pin Function

www.mcu.com.cn 52 / 703

Table 2-15 Example of register settings when using P120 to P124 pin functions

Pin

name

Features used

PMC

xx

PM

xx

Pxx

POMxx

PxxCFG

(Output

Multiplexing

Configuration

Register)

xxPCFG (Input

Multiplexing

Configuration

Register)

SPIPCFG

remark

The feature name

Input/out

put

P120

P120

input

0

1

×

×

×

×

×

output

0

0

0/1

0



×

×

N-

channel

open-

drain

output

0

0

0/1

1

×

ANI14

Analog

channel

1

×

×

×

×

×

×

VCOUT0

output

0

0

0

0



×

×

Mappable

concurrent inputs

input

0

1

×

×

×

Configure

xxPCFG

×

Please refer to 2.3.9

Mappable

concurrent output

output

0

0

0/1

0

Configure the

P120CFG

×

×

Please refer to 2.3.10

Mappable

bidirectional

communication

(SDA00/SDAA0/SC

LA0)

bidirectio

nal

0

0

0/1

1



Configure

SDI00PCFG/SD

AA0PCFG/SCLA

0PCFG

×

Please refer to 2.3.9

P121

P121

input

-

1

×

-

×

×

×

output

-

0

0/1

-



×

×

N-

channel

open-

drain

output

-

0

0/1

-

×

X1

-

-

×

×

-

×

×

×

EXCLK=0,

OSCSEL=1

Mappable

concurrent inputs

input

-

1

×

-

×

Configure

xxPCFG

×

For EXCLK=0 and

OSCSEL=0, please

refer to 2.3.9

Mappable

concurrent output

output

-

0

0/1

-

Configure the

P121CFG

×

×

For EXCLK=0 and

OSCSEL=0, please

refer to 2.3.10

P122

P122

input

-

1

×

-

×

×

×

output

-

0

0/1

-



×

×

N-

channel

open-

drain

output

-

0

0/1

-

×

X2

-

-

×

×

-

×

×

×

EXCLK=0,

OSCSEL=1

EXCLK

input

-

×

×

-

×

×

×

EXCLK=1,

OSCSEL=1

Mappable

concurrent inputs

input

-

1

×

-

×

Configure

xxPCFG

×

For EXCLK=0 and

OSCSEL=0, please

refer to 2.3.9

Mappable

concurrent output

output

-

0

0/1

-

Configure the

P122CFG

×

×

For EXCLK=0 and

OSCSEL=0, please

refer to 2.3.10

P123

P123

input

-

1

×

-

×

×

×

output

-

0

0/1

-



×

×

N-

channel

open-

drain

output

-

0

0/1

-

×

XT1

-

-

×

×

-

×

×

×

EXCLKS=0,

OSCSELS=1

Mappable

concurrent inputs

input

-

1

×

-

×

Configure

xxPCFG

×

For EXCLKS=0 and

OSCSELS=0, refer

to 2.3.9

Mappable

concurrent output

output

-

0

0/1

-

Configure the

P123CFG

×

×

Please refer to 2.3.10

for EXCLKS=0 and

OSCSELS=0

P124

P124

input

-

1

×

-

×

×

×

output

-

0

0/1

-



×

×

N-

channel

-

0

0/1

-

×

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