Siemens ERTEC200 User Manual
4.3.3
Address Assignment of Timer Registers
The timer registers are 32 bits in width. For read/write access of the timer registers to be meaningful, a 32-bit access is
required. However, a byte-by-byte write operation is not intercepted by the hardware.
Timer
(Base Address 0x4000_2000)
Register Name Offset Address Address Area
Access
Default
Description
CTRL_STAT0
0x0000
4 bytes
R/W
0x00000000
Control/status register timer 0
CTRL_STAT1
0x0004
4 bytes
R/W
0x00000000
Control/status register timer 1
RELD0
0x0008
4 bytes
R/W
0x00000000
Reload register timer 0
RELD1
0x000C
4 bytes
R/W
0x00000000
Reload register timer 1
CTRL_PREDIV
0x0010
4 bytes
R/W
0x00000000 Control register for both prescalers
RELD_PREDIV
0x0014
4 bytes
R/W
0x00000000 Reload register for both prescalers
TIM0
0x0018
4 bytes
R
0x00000000
Timer 0 value register
TIM1
0x001C
4 bytes
R
0x00000000
Timer 1 value register
TIM2_CTRL
0x0020
4 bytes
R/W
0x00000000
Timer 2-Control Register
TIM2
0x0024
4 bytes
R
0x00000000
Timer 2 count value register
Table 10: Overview of Timer Registers
4.3.4
Timer Register Description
CTRL_STAT0
R/W
Addr.: 0x4000_2000 Default: 0x0000_0000
Description
Control/status register 0. Configuration and control bits for Timer No. 0 .
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).
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.
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
Important note: If timers 0 and 1 are cascaded, the Reload mode setting of
Timer 0 is irrelevant.
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
Important note: If timers 0 and 1 are cascaded, the Reload mode setting of
Timer 0 is irrelevant.
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).
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).
31-6 Reserved
Not relevant (read=0)
Important note: The bits designated with *) are not applicable if the timers are cascaded! See CTRL_STAT1
Copyright © Siemens AG 2007. All rights reserved.
40
ERTEC 200 Manual
Technical data subject to change Version 1.1.0