peb20534 Infineon Technologies Corporation, peb20534 Datasheet - Page 322

• Manufacturer Part Number: peb20534
• Description: Dma Supported Serial Communication Controller With 4 Channels
• Manufacturer: Infineon Technologies Corporation

Data Sheet
CNT(2..0)
TVALUE
(23:0)
Counter
The meaning of this bit field depends on the timer mode.
In ’internal timer mode’ (HDLC Automode and bit TMD=’1’):
• Retry Counter (in HDLC protocol known as ’N2’):
In external timer mode (bit TMD=’0’):
• Restart Counter :
Timer Expiration Value
This bit field determines the timer expiration period ’t’:
(’CP’ is the clock period depending on bit ’SRC’.)
Bit field ’CNT’ indicates the number of S-Command frames (with poll
bit set) which are transmitted autonomously by the DSCC4 after every
expiration of the time out period ’t’ (determined by ’VALUE’), in case
an I-Frame gets not acknowledged by the opposite station. The
maximum value is 6 S-command frames. If ’CNT’ is set to ’7’, the
number of S-commands is unlimited in case of no acknowledgement.
Bit field ’CNT’ indicates the number of automatic restarts which are
performed by the DSCC4 after every expiration of the time out period
’t’, in case the timer is not stopped by writing a zero to bit field
’TVALUE’.The maximum value is 6 restarts. If ’CNT’ is set to ’7’, a
timer interrupt is generated periodically with time period ’t’ determined
by bit field ’TVALUE’.
t
=
322
TVALUE
+
Detailed Register Description
1
CP
PEB 20534
PEF 20534
(all modes)
(all modes)
2000-05-30