C161V_96 Datasheet, PDF (147/260 Pages) Siemens Semiconductor Group – 16-Bit CMOS Single-Chip Microcontrollers

10Jul97@15:19h
The General Purpose Timer Units / C161
GPT1 Core Timer T3
The core timer T3 is configured and controlled via its bitaddressable control register T3CON.
T3CON (FF42_H / A1_H)
SFR
Reset Value: 0000_H
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
T3
T3
-
-
-
-
- _OTL T3OE _UDE T3UD T3R
T3M
T3I
-
-
-
-
- rw rw rw rw rw
rw
rw
Bit
T3I
T3M
T3R
T3UD
T3UDE
T3OE
T3OTL
Function
Timer 3 Input Selection
Depends on the operating mode, see respective sections.
Timer 3 Mode Control (Basic Operating Mode)
000:
001:
010:
011:
Timer Mode
Counter Mode ¹⁾
Gated Timer with Gate active low ¹⁾
Gated Timer with Gate active high ¹⁾
1XX:
Reserved. Do not use this combination.
Timer 3 Run Bit
T3R = ‘0’: Timer / Counter 3 stops
T3R = ‘1’: Timer / Counter 3 runs
Timer 3 Up / Down Control ²⁾
Timer 3 External Up/Down Enable ²⁾
Alternate Output Function Enable ¹⁾
T3OE = ‘0’: Alternate Output Function Disabled
T3OE = ‘1’: Alternate Output Function Enabled
Timer 3 Output Toggle Latch
Toggles on each overflow / underflow of T3. Can be set or reset by software.
1) _{This function cannot be selected on the C161V.}
2) _{For the effects of bits T3UD and T3UDE refer to the direction table below.}
Timer 3 Run Bit
The timer can be started or stopped by software through bit T3R (Timer T3 Run Bit). If T3R=‘0’, the
timer stops. Setting T3R to ‘1’ will start the timer.
In gated timer mode, the timer will only run if T3R=‘1’ and the gate is active (high or low, as
programmed).
Semiconductor Group
9-3