UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 293

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

9.6.2
in synchronization with an external trigger, and retained there.
trigger). The count value of TM1 in the process of being counted is fetched into the capture register (CR12), or the capture/
compare register (CR11) when a capture operation is specified, in synchronization with the capture trigger, and is retained there.
The contents of the CR11 and CR12 are retained until the next capture trigger is generated.
are set as capture triggers, the width of pulses input from off-chip can be measured, and if a capture trigger is generated by a
single edge, the input pulse cycle can be measured.
by capture trigger.
Timer/counter 1 performs capture operations in which the timer register 1 (TM1) count value is fetched into the capture register
A valid edge detected from the input of the external interrupt request input pin (INTP0) is used as the external trigger (capture
The capture trigger valid edge is set by means of external interrupt mode register 0 (INTM0). If both rising and falling edges
See Figure 19-1 in CHAPTER 19 EDGE DETECTION FUNCTION for details of the INTM0 format.
When CR11 is used as a capture register, TM1 can be cleared as soon as the contents of TM1 have been captured to CR11
Remark Dn: TM1 count value (n = 0, 1, 2, ...)
Capture Operations
CLR10 = 0, CLR11 = 0, CM = 1, BW1 = 0
Capture/Compare
Register (CR11)
Interrupt Request
TM1
Count Value
Pin Input
INTP0
INTP0
OVF1
0H
Count Start
Figure 9-16 Capture Operation in 8-Bit Operating Mode
D0
CHAPTER 9 TIMER/COUNTER 1
D0
D1
FFH
D1
D2
D2
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