EM6812F2TP24B datasheet(42/81 Pages) EMMICRO

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EM6812

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11 Port B

11.1

Basic features

The port B is an 8-bit general-purpose input/output port. The CPU can read the input state in all modes. All selections

concerning the port B are bit-wise executable on PB[0] to PB[7].

These are:

Input / Output selection

CMOS or NCH Open Drain Outputs

Pull resistor selection. Pull-up or Pull-down. When both are selected, pull-up has the priority.

Special features

SPI serial port interface

Frequency outputs

−

Timer PWM and Frequency generation

−

Divided RC and Crystal oscillator frequencies

Dual Port Ram data bus

Table 37. Port B External Connectivity

Port B output connectivity

Signal1 to 4 selection on PB[3:0] with EnSig bit set

Sig1Sel[1:0] --> selects special output source for PB[0]

Sig2Sel[1:0] --> selects special output source for PB[1]

Sig3Sel[1:0] --> selects special output source for PB[2]

Sig4Sel[1:0] --> selects special output source for PB[3]

PortB

Normal

Output

Serial

Interface

Freq

Output

Dual Port

RAM

SigXSel[1,0]

‘00’

SigXSel[1,0]

‘01’

SigXSel[1,0]

‘10’

SigXSel[1,0]

‘11’

Output

drive

PB[7]

PBOut[7]

SIN

input

DPData[7]

output

Drive 1

PB[6]

PBOut[6]

SOUT

output

DPData[6]

output

Drive 1

PB[5]

PBOut[5]

SCLK

input/o

utput

DPData[5]

output

Drive 1

PB[4]

PBOut[4]

DPData[4]

output

Drive 1

PB[3]

PBOut[3]

Signal4

DPData[3]

output

PWM4

Not PWM3

Pr1Ck[11]

Pr1Ck[0]

Drive 2

PB[2]

PBOut[2]

Signal3

DPData[2]

output

PWM3

Not PWM4

Pr2CkSource

Pr1CkSource

Drive 2

PB[1]

PBOut[1]

Signal2

DPData[1]

output

PWM2

Not PWM1

Pr1Ck[11]

Pr1Ck[0]

Drive 2

PB[0]

PBOut[0]

Signal1

DPData[0]

output

PWM1

Not PWM2

Pr2CkSource

Pr1CkSource

Drive 2

11.1.1 Special function priority handling

•

Highest priority is on the Dual Port Ram function which takes full control of the output when the DPR is externally

accessed in read mode (EnDualRAM=’1’, ExtCEn=’1’, ExtWEn=’0’).

•

Second priority is the Serial interface settings and the Frequency outputs. The serial interface selection with bit EnSPI

automatically configures the SIN, SOUT and SCLK terminals.

On the same priority level is also the Frequency outputs. As soon as one of the EnSig bits is written the

corresponding PB terminal becomes output.

•

Last priority has the normal mode data output with PBOut[n] and direction with IOSelPB[n].

Please note that SPI, DPR and Frequency out selection selections do not change the normal port B output data or direction

setting, but force their own IO requirement while used. Refer to chapter 11.4 Special IO operation.

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