Siemens ERTEC 200P-2 Manual page 275

Ext_gate_trig_enable
Gate_polarity
Gate_effect
Timer_out_polarity
Event1/2_control
Event1/2_Inversion
The Init_bit is an initialization bit which resets the TIMER module, loads (restarts) the
counter with the value from the load register and loads the prescaler with the value from
the prescaler register. It deletes all values in the event registers and resets the edge
evaluation of the event inputs and the EXT_GATE_TRIG signal. After having been set by
the software, this bit is automatically deleted again, a reading of the bit by the software
always results in the value '0'. The definition is carried out in accordance with the follow-
ing table:
Init_bit
0
1
The counter counts/loads with the count/load clock. The selection is done by the mode
register bit Clk_input_select and the value of the prescaler register in accordance with the
following table:
Clk_input_select
0
1
The Reload_disable bit determines if the counter stops the counting process when it has
reached the value '0' (single mode) or if the counter is automatically loaded = newly start-
ed with the reload value from the load register when the value '0' has been reached (re-
load mode). The definition is carried out in accordance with the following table:
Reload_disable
0
1
The DIS_RLD_WHEN_WR_LDREG bit in the mode register determines the effect of the
writing of a new value on the load register:
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Technical data subject to change
Bit Init_bit not active (no initialization)
Bit Init_bit active (initialization)
Count/load clock = rising edge of CLK_TIMT;
The counting/loading of the counter with the CLK_TIMT edge
only takes place if the prescaler value is '0'
Count/load clock = external gate/trigger signal (edge evaluation
with CLK_TIMT is valued as count/load enable signal)
Reload mode active
Single mode active
Function
Function
Function
275 ERTEC 200P-2 Manual
Version 1.0