HMS91C8032 datasheet(77/157 Pages) HYNIX

No. de pieza	HMS91C8032

Descripción Electrónicos	HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS

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Fabricante Electrónico	HYNIX [Hynix Semiconductor]

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HMS91C8032/97C8032

74

NOV., 2001 Ver 1.02

Example) FMIFC : 10.7 MHz

Gate Time : 32 ms

N = (FFMIFC / 4) x TGATE = (10.7MHz/4) x 32ms

= 85600 (decimal) = 14E60H (hexadecimal)

(2) AMIF count mode (AMIFC pin)

FAMIFC = N / TGATE (KHz)

N : AMIF Count Register Value

Example) AMIFC : 450 MHz

Gate Time : 32 ms

N = FAMIFC x TGATE = 450 KHz x 32ms

= 14400 (decimal) = 3840H (hexadecimal)

Notes on Frequency Counter

(1) Notes on using frequency counter

Because signals are input to the frequency counter from an input

pin (FMIFC or AMIFC pin) with an AC amplifier as shown in

Figure 4-34Because signals are input to the frequency counter

Figure 4-32 Input Pin and Mode Selection Block Diagram

Figure 4-33 Gate Timing of Frequency Counter

FMIFC

AMIFC

AMP

1/4

IF Counter

Register

FMIF Counter Mode

AMIF Counter Mode

AMP

8ms

32ms

128ms

Counting starts

Sets IFCST

Clears IFCST

Sets IFCJR

Clears IFCJR if IFCMOD is read or

IF counter interrupt service routine is started.

Internal

250Hz

8ms

32ms

128ms

IFCST

IFCJR

{

(8/32/128ms)

Counting ends

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HMS91C8032 Datasheet(PDF) 77 Page - Hynix Semiconductor

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