Siemens ERTEC200 - Manual (Page 41)

CTRL_STAT1 R/W Addr.: 0x4000_2004 Default: 0x0000_0000
Description Control/status register 1. Configuration and control bits for Timer No. 1.
Bit No. Name Description
0 Run/xStop *) Stop/start of timer:
0: Timer is stopped
1: Timer is running
Note: If this bit = 0, the timer interrupt is inactive (0) and the status bit (Bit 5) is
reset (0).
1 Load Trigger=Load the timer with the reload register value:
0: Not relevant
1: Timer is loaded with the value of the reload register
(irrespective of Bit 0=Run/xStop)
While this bit can be read back, it only has an effect at the instant of writing.
Writing a value of 1 to this bit is sufficient to trigger the timer; a 0/1 edge is not
needed.
2 Reload mode *) Reload mode (continuous mode) of the timer.
0: Timer stops at value 00000000h
1: Timer is loaded with the reload register value when the timer value is
00000000h
and the timer continues running
3 Reserved Not relevant (can be read/write-accessed)
4 Reserved Not relevant (read=0)
5 Status Timer status (writing is ignored)
0: Timer has not expired
1: Timer has expired (count is 0 and Run/xStop=Bit 0=1)
Note: This bit can only be read as 1 if Run/xStop (Bit 0) is active (1).
6 Cascading Cascading of timer
0: Not relevant
1: Cascading of timers 0 and 1
31-7 Reserved Not relevant (read=0)
Important note: The bits designated with *) are relevant to Timer 0 as well if the timers are cascaded!
RELD0 R/W Addr.: 0x4000_2008 Default: 0x0000_0000
RELD1 R/W Addr.: 0x4000_200C Default: 0x0000_0000
Description Reload registers 0 to 1. Reload value for timers 0 to 1.
Bit No. Name Description
31:0 Reload [31:0] Reload value of timer
CTRL_PREDIV R/W Addr.: 0x4000_2010 Default: 0x0000_0000
Description Control register for the two prescalers
Bit No. Name Description
0 Run/xStop_V0 Stop/start of prescaler 0:
0: Prescaler 0 is stopped
1: Prescaler 0 is running
1 Load_V0 Trigger = loading of prescaler 0 with the reload register value:
0: Not relevant
1: Prescaler 0 is loaded with the value of the reload register
While this bit can be read back, the trigger only has an effect
at the instant of writing. The prescaler is loaded independently of the status
of Run/xStop_V0.
2 Run/xStop_V1 Stop/start of prescaler 1:
0: Prescaler 1 is stopped
1: Prescaler 1 is running
3 Load_V1 Trigger = loading of prescaler 1 with the reload register value:
0: Not relevant
1: Prescaler 1 is loaded with the value of the reload register
While this bit can be read back, the trigger only has an effect
at the instant of writing. The prescaler is loaded independently of the status
of Run/xStop_V1.
31-4 Reserved Not relevant (read=0)
Remark about the prescalers: The current counter value of the prescalers cannot be read. In addition, there are no status
bits for the prescalers indicating when the counter state is 0. The prescalers always run cyclically (in Reload mode).
Copyright © Siemens AG 2007. All rights reserved. 41 ERTEC 200 Manual
Technical data subject to change Version 1.1.0