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