PEB3086 Datasheet, PDF (44/262 Pages) Infineon Technologies AG – ISDN SUBSCRIBER ACCESS CONTROLLER

ISAC-SX
PEB 3086
Description of Functional Blocks
Timer 1
The host controls the timer 1 by setting bit CMDRD.STI to start the timer and by writing
register TIMR1 to stop the timer. After time period T1 an interrupt (AUXI.TIN1) is
generated continuously if CNT=7 or a single interrupt is generated after timer period T if
CNT<7 (Figure 11).
Retry Counter
0 ... 6 : Count Down Timer
7 : Periodic Timer
T = CNT x 2.048 sec + T1
T = T1
Expiration Period
T1 = (VALUE + 1) x 0.064 sec
76543210
TIMR1 CNT VALUE 24_H
21150_14
Figure 11 Timer 1 Register
Timer 2
The host starts and stops timer 2 in TIMR2.CNT (Figure 12). If TIMR2.TMD=0 the timer
is operating in count down mode, for TIMR2.TMD=1 a periodic interrupt AUXI.TIN2 is
generated. The timer length (for count down timer) or the timer period (for periodic timer),
respectively, can be configured to a value between 1 - 63 ms (TIMR2.CNT).
Timer Mode
0 : Count Down Timer
1 : Periodic Timer
Timer Count
0 : Timer off
1 ... 63 : 1 ... 63 ms
7 65 4 3 210
TIMR2 ^{TMD 0}
CNT
65_H
21150_14
Figure 12 Timer 2 Register
Data Sheet
44
2003-01-30