EM78P809N

8-Bit Microcontroller

P63

TEN

TONE Pin

Fig. 8. TONE Output Pin Timing Chart

Fosc/223

 

Fosc/221

 

Fosc/216

 

Fosc/214

MUX

13

Fosc/2

 

Fosc/212

Fosc/211

Fosc/29

TBTEN

TBTCK2:0

3

 

TBKTC

Falling Edge

Detector

TBT

Interrupt

Fig. 9. TBT Configuration

Time Base Timer is used to generate the base time for key scan or dynamic display processing. The interrupt is generated in the first falling edge of the source clock after TBTEN is set to “1”.

Source Clock

TBTEN

TBT Interrupt

Fig. 10. Time Base Timer Timing Chart

32

Product Specification (V1.0) 07.26.2005

(This specification is subject to change without further notice)

Page 36
Image 36
IBM EM78P809N manual Tone Output Pin Timing Chart