tmp19a44fda TOSHIBA Semiconductor CORPORATION, tmp19a44fda Datasheet - Page 323

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

16-bit Timer/Event Counters (TMRBs)
Count clock (TB3IN0
Count
TB0OUT
Taking data into TB3CP0
Taking data into TB3CP1
pin input)
INTTB0
Enable reverse when data is
taken into TB6CP0
Count clock
(Prescaler output clock)
TB6IN0 input
(External trigger pulse)
Match with TB6RG1
Timer output TB6OUT pin
Frequency measurement
If a delay is not required, TB6FF0 is reversed when data is taken into TB6CP0, and TB6RG1 is set to
the sum of the TB6CPO value (c) and the one-shot pulse width (p), (c + p), by generating the INT4
interrupt. TB6FF0 is enabled to reverse when UC6 matches with TB6RG1, and is disabled by
generating the INTTB6 interrupt.
Fig. 11.6 One-shot Pulse Output Triggered by an External Pulse (Without Delay)
By using the capture function, the frequency of an external clock can be measured.
To measure frequency, another 16-bit timer (TMRB0) is used in combination with the 16-bit event
counter mode (TMRB0 reverses TB0FFCR to specify the measurement time).
The TB3IN0 pin input is selected as the TMRB3 count clock to perform the count operation using an
external input clock. TB3MOD<TB3CPM1:0> is set to "11." This setting allows a count value of the
16-bit UC0 up-counter to be taken into the capture register (TB3CP0) upon the rising of a timer flip-
flop (TB0FFCR) of the 16-bit timer (TMRB0), and an UC0 counter value to be taken into the capture
register (TB3CP1) upon the falling of TB3FF of the 16-bit timer (TMRB0).
A frequency is then obtained from the difference between TB0CP0 and TB0CP1 based on the
measurement, by generating the INTTB3 16-bit timer interrupt.
For example, if the set width of TB3FF level "1" of the 16-bit timer is 0.5 s and if the difference
between TB0CP0 and TB0CP1 is 100, the frequency is 100 / 0.5 s = 200 Hz.
C1
C1
c
Enable reverse
Fig. 11.7 Frequency Measurement
Taking data into the capture register TB6CP0
INT4 generation
Pulse width
TMP19A44(rev1.3) 11-25
(p)
c + p
INTTB6 generation
C2
C2
Disable reverse when data is taken into
TB6CP1
Taking data into the capture
register TB6CP1
C1
TMP19A44
2010-04-01
C2