em78p809n ELAN Microelectronics Corp, em78p809n Datasheet - Page 36

• Manufacturer Part Number: em78p809n
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

EM78P809N
8-Bit Microcontroller
32 •
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
TBT Interrupt
P63
TEN
TONE Pin
Fosc/2
Fosc/2
Fosc/2
Fosc/2
Fosc/2
Fosc/2
Fosc/2
Fosc/2
TBTEN
23
21
16
14
13
12
11
9
TBTCK2:0
MUX
Fig. 10. Time Base Timer Timing Chart
3
Fig. 8. TONE Output Pin Timing Chart
TBKTC
Fig. 9. TBT Configuration
TBTEN
(This specification is subject to change without further notice)
Product Specification (V1.0) 07.26.2005
Falling Edge
Detector
Interrupt
TBT