PSB21473FV13XT Infineon Technologies, PSB21473FV13XT Datasheet - Page 190

• Manufacturer Part Number: PSB21473FV13XT
• Manufacturer: Infineon Technologies

Specifications of PSB21473FV13XT

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3.135V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 144
• Lead Free Status / RoHS Status: Compliant

Data Sheet
Count Direction Control
The count direction of the core timer can be controlled either by software or by the
external input line T3EUD (Timer T3 External Up/Down Control Input). These options are
selected by bits T3UD and T3UDE in control register T3CON. When the up/down control
is done by software (bit T3UDE = ‘0’), the count direction can be altered by setting or
clearing bit T3UD. When T3UDE = ‘1’, line T3EUD is selected to be the controlling
source of the count direction. However, bit T3UD can still be used to reverse the actual
count direction, as shown in the table below. If T3UD = ‘0’ and line T3EUD shows a low
level, the timer is counting up. With a high level at T3EUD the timer is counting down. If
T3UD = ‘1’, a high level at line T3EUD specifies counting up, and a low level specifies
counting down. The count direction can be changed regardless of whether the timer is
running or not.
When line T3EUD is used as external count direction control input, its associated port
pin must be configured as input.
Table 14-1
Line TxEUD
Note: The direction control works the same for core timer T3 and for auxiliary timers T2
Timer 3 Overflow/Underflow Monitoring
An overflow or underflow of timer T3 will clock the overflow toggle latch T3OTL in control
register T3CON. T3OTL can also be set or reset by software. Bit T3OE (Overflow/
Underflow Output Enable) in register T3CON enables the state of T3OTL to be
monitored via an external line T3OUT. If this line is configured as output, T3OTL can be
used to control external HW.
In addition, T3OTL can be used in conjunction with the timer over/underflows as an input
for the counter function or as a trigger source for the reload function of the auxiliary
timers T2 and T4. For this purpose, the state of T3OTL does not have to be available at
any port pin, because an internal connection is provided for this option.
X
X
0
1
0
1
and T4. Therefore the lines and bits are named Tx...
GPT1 Core Timer T3 Count Direction Control
Bit TxUDE
0
0
1
1
1
1
Bit TxUD
0
1
0
0
1
1
190
Count Direction
Count Up
Count Down
Count Up
Count Down
Count Down
Count Up
General Purpose Timer Unit
PSB 21473
2003-03-31
INCA-D