EM78P257AP datasheet(63/91 Pages) EMC

63 / 91 page

EM78P257

OTP ROM

This specification is subject to change without prior notice.

07.27.2004 (V1.4)

• The decimal value of its contents determines the number of oscillator cycles indicating that the IR

OUT pin is active. The inactive period of IR OUT can be calculated as follow:

tHigh=(decimal value held in High-time register)/fosco

• Pulse timer Register :The contents of the Low-time and High-time registers which are loaded

alternately into the Pulse timer. When loaded, the Pulse timer contents are decremented by “1” every

oscillator cycle. Upon reaching zero, the Pulse timer will be loaded with the contents of the other

Table 29 TCCX Status Register (2)

TCCBIE

TCCBTS

TCCBTE

TCCCIE

TCCCTS

TCCCTE

• Bit 6(TCCBIE) TCCBIF interrupt enable bit.

0: disable TCCBIF interrupt

1: enable TCCBIF interrupt

Table 30 TCCX Control Register

TCC2E

TCC4E

TCC6E

TCCBE

• Bit 4 (TCCBE): Control bit which is used to enable most significant byte of counter

1 = Enable most significant byte of TCCBH.

0 = Disable most significant byte of TCCBH (default value).

Table 31 IR Control Register

DP1

DP0

MF1

MF0

IRE

LGP

PWM

• Bit7:Bit6 (DP1:DP0) : Duty and Period ratio

DP1

DP0

Ratio

1:2(default)

1:3

1:4

• Bit 5:Bit 4 ( MF1:MF0 ) : Modulated frequency

MF1

MF0

Fosco

Fosc/1

Fosc/4

Fosc/8

• Bit 3(IRE) Infrared Remote Enable bit

0: Disable IRE. Disable H/W Modulator Function.

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