Intel 80C188XL - Manual (Page 234)

9-5
TIMER/COUNTER UNIT
Figure 9-3. Timers 0 and 1 Flow Chart (Continued)
No
(Use"B")
No
Counter =
Compare "A"
?
Alternating
Maxcount Regs
(ALT = 1)
?
Using
Maxcount A
(RIU = 0)
?
Yes
No
No
Yes
(Use"A")
Counter =
Compare "B"
?
Counter =
Compare "A"
?
Continuous Mode
(CONT=1)
?
Yes
No
Done
Clear RIU Bit
TOUT Pin Driven High
Continued From
"A"
No Yes
Done
Clear Enable Bit
(Stop Counting)
No
Continuous Mode
(CONT=1)
?
Yes
Pulse TOUT Pin
Low For 1 Clock
Clear Enable Bit
(Stop Counting)
Set RIU Bit
TOUT Pin Driven Low
Yes
Yes
Yes
Interrupt Bit Set
?
No
Clear Counter
Request Interrupt
A1295-0A