EM6821 datasheet(19/68 Pages) EMMICRO

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EM6821

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6.4.4 PWM and Frequency Output

PB[3] can also be used to output the PWM (Pulse Width Modulation) signal from the 10-Bit Counter, the

Ck[16], Ck[11] as well as the Ck[1] prescaler frequencies.

-Selecting PWM

output on PB[3] with bit PWMOn in register RegPresc and running the counter.

-Selecting Ck[16] output on PB[2] with bit PB32kHzOut in register OPTFSelPB

-Selecting Ck[11] output on PB[1] with bit PB1kHzOut in register OPTFSelPB

-Selecting Ck[1 ]

output on PB[0] with bit PB1HzOut

in register OPTFSelPB

6.5 Port B Registers

Table 6.5.1 Register RegPBData

Bit

Name

Reset

R/W

Description

PBData[3]

R*/W

PB[3] input and output

PBData[2]

R*/W

PB[2] input and output

PBData[1]

R*/W

PB[1] input and output

PBData[0]

R*/W

PB[0] input and output

* : Direct read on the port B terminal (not the internal register)

Table 6.5.2 Register RegPBCntl

Bit

Name

Reset

R/W

Description

PBIOCntl[3]

R/W

I/O control for PB[3]

PBIOCntl[2]

R/W

I/O control for PB[2]

PBIOCntl[1]

R/W

I/O control for PB[1]

PBIOCntl[0]

R/W

I/O control for PB[0]

Default "0" is: port B in input mode

Table 6.5.3 Option Register OPTFSelPB

Bit

Name

power on

value

R/W

Description

InpResSleep

R/W

Reset from sleep with port A

PB32kHzOut

R/W

Ck[16] output on PB[2]

PB1kHzOut

R/W

Ck[11] output on PB[1]

PB1HzOut

R/W

Ck[1] output on PB[0]

Default "0" is: No frequency output, port A Input Reset can not reset the SLEEP mode.

Table 6.5.4 Option Register OPTNoPdPB

Bit

Name

power on

value

R/W

Description

NoPdPB[3]

R/W

No pull-down on PB[3]

NoPdPB[2]

R/W

No pull-down on PB[2]

NoPdPB[1]

R/W

No pull-down on PB[1]

NoPdPB[0]

R/W

No pull-down on PB[0]

Default "0" is: Pull-down on

Table 6.5.5 Option Register OPTNchOpDPB

Bit

Name

power on

value

R/W

Description

NchOpDPB[3]

R/W

Nch. Open Drain on PB[3]

NchOpDPB[2]

R/W

Nch. Open Drain on PB[2]

NchOpDPB[1]

R/W

Nch. Open Drain on PB[1]

NchOpDPB[0]

R/W

Nch. Open Drain on PB[0]

Default "0" is: CMOS output

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