Address Assignment Of Timer Registers; Timer Register Description; Table 10: Overview Of Timer Registers - Siemens ERTEC200 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.
Register Name Offset Address Address Area
CTRL_STAT0
CTRL_STAT1
RELD0
RELD1
CTRL_PREDIV
RELD_PREDIV
TIM0
TIM1
TIM2_CTRL
TIM2

Table 10: Overview of Timer Registers

4.3.4

Timer Register Description

CTRL_STAT0
Description Control/status register 0. Configuration and control bits for Timer No. 0 .
Bit No. Name
0 Run/xStop *)
1 Load
2 Reload mode *)
3 Reserved
4 Reserved
5 Status
31-6 Reserved
Important note: The bits designated with *) are not applicable if the timers are cascaded! See CTRL_STAT1
Copyright © Siemens AG 2007. All rights reserved.
Technical data subject to change
Timer
(Base Address 0x4000_2000)
0x0000 4 bytes
0x0004 4 bytes
0x0008 4 bytes
0x000C 4 bytes
0x0010 4 bytes
0x0014 4 bytes
0x0018 4 bytes
0x001C 4 bytes
0x0020 4 bytes
0x0024 4 bytes
R/W Addr.: 0x4000_2000
Description
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).
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.
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.
Not relevant (can be read/write-accessed)
Not relevant (read=0)
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).
Not relevant (read=0)
Access Default
R/W 0x00000000
R/W 0x00000000
R/W 0x00000000
R/W 0x00000000
R/W 0x00000000 Control register for both prescalers
R/W 0x00000000 Reload register for both prescalers
R 0x00000000
R 0x00000000
R/W 0x00000000
R 0x00000000
40
Description
Control/status register timer 0
Control/status register timer 1
Reload register timer 0
Reload register timer 1
Timer 0 value register
Timer 1 value register
Timer 2-Control Register
Timer 2 count value register
Default: 0x0000_0000
ERTEC 200 Manual
Version 1.1.0