tmp19a44fda TOSHIBA Semiconductor CORPORATION, tmp19a44fda Datasheet - Page 331

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

32-bit Input Capture (TMRC)
Fig. 12.2 Capture Inputs and Capture Factor Outputs (Outputs Produced by the Edge Detection Circuit)
12.2.2
12.2.3
12.2.4
The noise removal circuit removes noises from an external clock source input (TBTIN) and a capture
trigger input (TcnIN) of the time base timer (TBT). It can also output input signals without removing
noises from them.
This is a 32-bit binary counter that counts up upon the rising of an input clock specified by the TBT
control register TBTCR of the time base timer.
Based on the TBTCR<TBTCLK3:0> setting, an input clock is selected from external clocks supplied
through the TBTIN pin and eight prescaler output clocks φT2, φT4, φT8, φT16, φT32, φT64, φT128,
and φT256.
"Count," "stop" or "clear" of the up-counter can be selected with TBTRUN<TBTRUN>. When a reset is
performed, the up-counter is in a cleared state and the timer is in an idle state. As counting starts, the
up-counter operates in a free-running condition. As it reaches an overflow state, the overflow interrupt
INTTBT is generated; subsequently, the count value is cleared to 0 and the up-counter restarts a count-
up operation.
This counter can perform a read capture operation.
By performing sampling, this circuit detects the input edge of an external capture input (TcnIN). It can
be set to "rising edge," "falling edge," "both edges" or "not capture" by provisioning the capture control
register CAPnCR<CPnEG1:0>. Fig. 12.2 shows capture inputs, outputs (capture factor outputs)
produced by the edge detection circuit, and specific detection circuit settings.
TCnIN input
Capture factor
(Rising edge setting)
(Falling edge setting)
(Both-edge setting)
(Not capture setting)
Noise Removal Circuit
32-bit Time Base Timer (TBT)
Edge Detection Circuit
TMP19A44 (rev1.3) 12-6
TMP19A44
2010-04-01