Filter
Top Products
217
CHAPTER 8 16-BIT TIMER/EVENT COUNTER
(2) One-shot pulse output using external trigger
If the 16-bit timer mode control register (TMC0), capture/compare control register 0 (CRC0), and the 16-
bit timer output control register (TOC0) are set as shown in Figure 8-33, a one-shot pulse is output from
the TO0/P30 pin with a TI00/P00 valid edge as an external trigger.
Any of three edge specifications can be selected-rising, falling, or both edges - as the valid edges for the
TI00/P00 pin by means of bits 2 and 3 (ES10 and ES11) of external interrupt mode register 0 (INTM0).
When a valid edge is input to the TI00/P00 pin, the 16-bit timer/event counter is cleared and started, and
output is activated by the count values set beforehand in 16-bit capture/compare register 01 (CR01).
Thereafter, output is inactivated by the count value set beforehand in 16-bit capture/compare register 00
(CR00).
Caution When outputting one-shot pulses, external trigger is ignored if generated again.
Figure 8-33. Control Register Settings for One-Shot Pulse Output Operation Using External Trigger
(a) 16-bit timer mode control register (TMC0)
(b) Capture/compare control register 0 (CRC0)
(c) 16-bit timer output control register (TOC0)
Caution Values in the following range should be set in CR00 and CR01.
0000H
≤ CR01 < CR00 ≤ FFFFH
Remark 0/1: Setting 0 or 1 allows another function to be used simultaneously with one-shot pulse output.
See the description of the respective control registers for details.
TMC0 00010000
OVF0TMC01TMC02TMC03
Clear & start with valid edge of TI00/P00 pin
CRC0 00/1000000
CRC00CRC01CRC02
CR00 set as compare register
CR01 set as compare register
TOC0 110/10/11100
TOE0TOC01LVR0LVS0OSPT OSPE TOC04
TO0 Output Enabled
Inversion of output on match of TM0 and CR00
Specified TO0 output F/F initial value
Inversion of output on match of TM0 and CR01
One-shot pulse output mode