XC161 Datasheet, PDF (31/419 Pages) Infineon Technologies AG – 16-Bit Single-Chip Microcontroller with C166SV2 Core Volume 2 (of 2): Peripheral Units

XC161 Derivatives
Peripheral Units (Vol. 2 of 2)
The General Purpose Timer Units
Field
Bits Typ Description
TxI
[2:0] rw
Timer Tx Input Parameter Selection
Depends on the operating mode, see respective
sections for encoding:
Table 14-7 for Timer Mode and Gated Timer Mode
Table 14-2 for Counter Mode
Table 14-3 for Incremental Interface Mode
1) See Table 14-1 for encoding of bits TxUD and TxEUD.
Timer T2/T4 Run Control
Each of the auxiliary timers T2 and T4 can be started or stopped by software in two
different ways:
• Through the associated timer run bit (T2R or T4R). In this case it is required that the
respective control bit TxRC = 0.
• Through the core timer’s run bit (T3R). In this case the respective remote control bit
must be set (TxRC = 1).
The selected run bit is relevant in all operating modes of T2/T4. Setting the bit will start
the timer, clearing the bit stops the timer.
In gated timer mode, the timer will only run if the selected run bit is set and the gate is
active (high or low, as programmed).
Note: If remote control is selected T3R will start/stop timer T3 and the selected auxiliary
timer(s) synchronously.
Count Direction Control
The count direction of the GPT1 timers (core timer and auxiliary timers) is controlled in
the same way, either by software or by the external input pin TxEUD. Please refer to the
description in Table 14-1.
Note: When pin TxEUD is used as external count direction control input, it must be
configured as input (its corresponding direction control bit must be cleared).
User’s Manual
GPT_X1, V2.0
14-17
V2.2, 2004-01