UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 211

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

7.4.6 One-shot pulse output operation
trigger (TI00n pin input).
(1) One-shot pulse output with software trigger
16-bit timer/event counter 0n can output a one-shot pulse in synchronization with a software trigger or an external
The basic operation setting procedure is as follows.
<1> Set the count clock by using the PRM0n register.
<2> Set the CRC0n register (see Figures 7-49 and 7-51 for the set value).
<3> Set the TOC0n register (see Figures 7-49 and 7-51 for the set value).
<4> Set any value to the CR00n and CR01n registers (0000H cannot be set).
<5> Set the TMC0n register to start the operation (see Figures 7-49 and 7-51 for the set value).
Remarks 1. For the setting of the TO0n pin, see 7.3 (5) Port mode register 0 (PM0) to (7) Port mode register
Setting
A one-shot pulse can be output from the TO0n pin by setting 16-bit timer mode control register 0n (TMC0n),
capture/compare control register 0n (CRC0n), and 16-bit timer output control register 0n (TOC0n) as shown in
Figure 7-49, and by setting bit 6 (OSPT0n) of the TOC0n register to 1 by software.
By setting the OSPT0n bit to 1, 16-bit timer/event counter 0n is cleared and started, and its output becomes
active at the count value (N) set in advance to 16-bit timer capture/compare register 01n (CR01n). After that, the
output becomes inactive at the count value (M) set in advance to 16-bit timer capture/compare register 00n
(CR00n)
Even after the one-shot pulse has been output, the TM0n register continues its operation. To stop the TM0n
register, the TMC0n3 and TMC0n2 bits of the TMC0n register must be set to 00.
Note The case where N < M is described here. When N > M, the output becomes active with the CR00n
Cautions 1. Do not set the OSPT0n bit while the one-shot pulse is being output. To output the one-
Remark n = 0 to 3
Note
2. For how to enable the INTTM00n (if necessary, INTTM01n) interrupt, see CHAPTER 17
register and inactive with the CR01n register. Do not set N to M.
.
13 (PM13).
INTERRUPT FUNCTIONS.
2. When using the one-shot pulse output of 16-bit timer/event counter 0n with a software
shot pulse again, wait until the current one-shot pulse output is completed.
trigger, do not change the level of the TI00n pin or its alternate-function port pin.
Because the external trigger is valid even in this case, the timer is cleared and started
even at the level of the TI00n pin or its alternate-function port pin, resulting in the output
of a pulse at an undesired timing.
CHAPTER 7 16-BIT TIMER/EVENT COUNTERS 00 TO 03
User’s Manual U17554EJ4V0UD
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