W6691CD WINBOND [Winbond], W6691CD Datasheet - Page 79

• Manufacturer Part Number: W6691CD
• Description: ISDN S/T Interface Transceiver
• Manufacturer: WINBOND [Winbond]

Bit 7-5 are fixed at “1” and bit 3 is fixed at '0". This means MO0C interrupt cannot be masked. The interrupt is
disabled when the bit is set.
8.9 Miscellaneous Register
8.9.1 Timer 1 Register TIMR1 Read/Write Address 38H
Value after reset : 00H
T1MD
expiration.
CNT6-0
The expiration time is defined as:
T1 = CNT[6:0] * 0.1 second
After writing this register, STT1 bit in D_CMDR register must be set to start the timer. This register can be read
only after the timer has been started. The read value indicates the timer's current count value. In case layer 1
is not activated, a C/I command "ECK" must be issued in addition to the STT1 command to start the timer.
Note: The timer is stopped when it expires in Single Count Down Mode(T1MD=0) or TIMR1 register is re-
written in both mode.
T1MD
0 = Single Count Down Mode: The timer counts once and generates a T1EXP interrupt when expires.
1 = Periodical Count Down Mode: The timer counts periodically and generates an T1EXP interrupt at each
7
Timer1 Mode
CNT6
Count Value
6
CNT5
5
CNT4
4
CNT3
3
CNT2
2
79
CNT1
1
CNT0
0
Preliminary W6691
Publication Release Date: Sep 2001
Revision 1.1