Siemens ERTEC200

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)

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 re gister

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).

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

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).

31-6 Reserved Not relevant (read=0)

Important note: The bits designated with *) are not applicable if the timers are cascaded! See CTRL_STAT1

Technical data subject to change Version 1.1.0