EM78468 datasheet(25/71 Pages) EMC

25 / 71 page

EM78468

8-BIT Microcontroller

Product Specification (V1.1) 04.11.2005

• 21

(This specification is subject to change without further notice)

the counter and read preset value. The pre-scaler is set by IOC91 register. After an

interruption, it will auto reload the preset value.

4.2.9

IOCC0/CNT2PR (Counter 2 Preset Register)

(Address: 0Ch, Bit 0 of R5 = “0”)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Bit 7 ~ Bit 0: All are Counter 2 buffer that user can read and write. The Counter 2 is an

8-bit down-count timer with 8-bit pre-scaler that is used as this register to preset the

counter and read preset value. The pre-scaler is set by IOC91 register. After an

interruption, it will reload the preset value.

When IR output is enabled, this control register can obtain carrier frequency output.

If the Counter 2 clock source is equal to FT –

Carrier frequency (Fcarrier) =

prescaler

)

value

preset

(

4.2.10 IOCD0/HPWTPR (High-Pulse Width Timer Preset Register)

(Address: 0Dh, Bit 0 of R5 = “0”)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Bit 7 ~ Bit 0: All are high-pulse width timer buffer that user can read and write.

High-pulse width timer preset register is an eight-bit down-count timer with 8-bit

pre-scaler that is used as IOCD0 to preset the counter and read preset value. The

pre-scaler is set by IOCA1 register. After an interruption, it will reload the preset value.

For PWM or IR application, this control register is set as high pulse width.

If the high-pulse width timer source clock is FT –

High pulse time =

)

value

preset

(

prescaler

4.2.11 IOCE0/LPWTPR (Low-Pulse Width Timer Preset Register)

(Address: 0Eh, Bit 0 of R5 = “0”)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Bit 7 ~ Bit 0: All are low-pulse width timer buffer that user can read and write. Low-pulse

width timer preset is an eight-bit down-count timer with 8-bit pre-scaler that is used as

IOCE0 to preset the counter and read preset value. The pre-scaler is set by IOCA1

For PWM or IR application, this control register is set as low pulse width.

If the low-pulse width timer source clock is FT –

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