tmp19a44fda TOSHIBA Semiconductor CORPORATION, tmp19a44fda Datasheet - Page 321

• Manufacturer Part Number: tmp19a44fda
• Description: 32bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

16-bit Timer/Event Counters (TMRBs)
11.6 Applications using the Capture Function
Count clock
(Internal clock)
TB6IN0 pin input
(External trigger pulse)
Match with TB6RG0
Match with TB6RG1
Timer output TB6OUT pin
The capture function can be used to develop many applications, including those described below:
One-shot pulse output triggered by an external pulse
Frequency measurement
Pulse width measurement
Time difference measurement
One-shot pulse output triggered by an external pulse
One-shot pulse output triggered by an external pulse is carried out as follows:
The 16-bit up-counter (UC6) is made to count up by putting it in a free-running state using the prescaler
output clock. An external pulse is input through the TB6IN0 pin. A trigger is generated at the rising of
the external pulse by using the capture function and the value of the up-counter is taken into the capture
registers (TB6CP0).
The INTC must be programmed so that an interrupt INT4 is generated at the rising of an external trigger
pulse. This interrupt is used to set the timer registers (TB6RG0) to the sum of the TB6CP0 value (c)
and the delay time (d), (c + d), and set the timer registers (TB6RG1) to the sum of the TB6RG0 values
and the pulse width (p) of one-shot pulse, (c + d + p).
In addition, the timer flip-flop control registers (TB6FFCR<TB6E1T1, TB6E0T1>) must be set to "11."
This enables triggering the timer flip-flop (TB6FF0) to reverse when UC6 matches TB6RG0 and
TB6RG1. This trigger is disabled by the INTTB6 interrupt after a one-shot pulse is output.
Symbols (c), (d) and (p) used in the text correspond to symbols c, d and p in Fig. 11.3.
Fig. 11.5 One-shot Pulse Output (With Delay)
c
Put the counter in a free-running state
Disable reverse when
data is taken into CAP6
Enable reverse
Taking data into the capture register (CAP6)
INT4 generation
TMP19A44(rev1.3) 11-23
Delay time
(d)
c + d
Enable
reverse
INTTB6 generation
Pulse width
(p)
c + d + p
INTTB6
generation
TMP19A44
2010-04-01