ST72371 datasheet(23/94 Pages) STMICROELECTRONICS

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ST72371/ST72372

3.4.5 Register Description

MISCELLANEOUS REGISTER (MISCR)

Read/Write

Reset Value: 0000 0000 (00h)

Bit 7 = EI4F

Falling Edge Detector Flag.

This bit is set by hardware when a falling edge oc-

curs on the pin assigned to EI4. An interrupt is

generated if EI4ITE=1 It is cleared by software.

0: No falling edge detected on EI4

1: Falling edge detected on EI4

Bit 6 = EI4ITE EI4 Interrupt Enable.

This bit is set and cleared by software.

0: EI4 interrupt disabled

1: EI4 interrupt enabled

Bit 5 = SMS

Slow Mode Select.

This bit is set and cleared by software. It is used to

select the slow or fast mode CPU frequency.

0: fCPU = Oscillator frequency / 6 (slow mode)

1: fCPU = Oscillator frequency / 3 (normal mode)

Bit 4: 1 = Reserved

Bit 0 = POC0 PWM/BRM Output Configuration Bit.

This bits is set and cleared by software. They se-

lect the PWM/BRM output configuration for pins

DA1-DA4.

0: Push-pull

1: Open drain

Note.

DA0 is only Push-Pull Output.

INTERRUPT REGISTER (ITRFRE)

Read/Write

Reset Value: 0000 0000 (00h)

Bit 7:5 = EI0F, EI1F, EI2F

Falling Edge Detector

Flags.

These bits are set by hardware when a falling

edge occurs on the pins assigned to EI0, EI1 or

EI2. They are cleared by software. When any of

these bits are set, an interrupt is generated if the

corresponding ITE bit =1 and the I bit in the CC

0: No falling edge detected

1: Falling edge detected

Bit 4 = EI3F

Rising Edge Detector Flag.

This bit is set by hardware when a rising edge oc-

curs on the pin assigned to EI3. It is cleared by

software. When EI3F is set an interrupt is generat-

ed if EI3ITE=1 and the I bit in the CC register = 0.

0: No rising edge detected on EI3

1: Rising edge detected on EI3

Bit 3:0 = EI0ITE, EI1ITE, EI2ITE, EI3ITE

Interrupt

Enable Bits.

These bits are set and cleared by software.

0: Interrupt disabled

1: Interrupt enabled

EI4F

EI4ITE

SMS

POC0

EI0F

EI1F

EI2F

EI3F

EI0ITE

EI1ITE

EI2ITE

EI3ITE

ST72371 数据表(PDF) 23 Page - STMicroelectronics

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