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UPD17708 Datasheet(PDF) 164 Page - NEC

No. de pieza UPD17708
Descripción Electrónicos  4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM
PDF  356 Pages
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Fabricante Electrónico  NEC [NEC]
Página de inicio  http://www.nec.com/
Logo NEC - NEC

UPD17708 Datasheet(HTML) 164 Page - NEC

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13.3.2 Clock selection, start/stop control, and gate control blocks
Figure 13-12 shows the configuration of these blocks.
The clock selection block selects a basic clock to operate timer 0 counter.
Four types of basic clocks can be selected by using the TM0CK1 and TM0CK0 flags.
Figure 13-13 shows the configuration and function of each flag.
The start/stop block controls the TM0MD flag and open/close signal from the gate control block, and starts
or stops the basic clock to be input to timer 0 counter by the TM0EN flag.
The gate control block sets the opening or closing conditions of the gate.
It sets whether the gate is opened or closed by a rising or falling of the input signal, by using the TM0GOEG
and TM0GCEG flags. This block also issues an interrupt request when the closing condition of the gate is
detected.
Figure 13-14 shows the configuration and function of each flag.
Figure 13-12. Configuration of Clock Selection, Start/Stop Control, and Gate Control Blocks
Selector
100 kHz
10 kHz
2 kHz
1 kHz
TM0CK1
TM0CK0
Clock selection
Divider
4.5 MHz
Start/stop
Timer 0 counter
TM0EN flag
TM0MD flag
TM0MD flag
P1A0/TM0G
TM0GOEG
TM0GCEG
Gate control
Open/
close
Edge
detection
Timer 0 interrupt



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