HT95R64 datasheet(63/82 Pages) HOLTEK

63 / 82 page

HT95R64/HT95R65

Rev. 1.00

March 3, 2010

Programmable Frequency Divider (PFD) Generator

- MUSIC

A Programmable Frequency Divider function, otherwise known as PFD, is integrated within the microcontroller, providing

a means of accurate frequency generation. It is composed of two functional blocks: a prescaler and a general counter.

PFD Control Register

The overall PFD function is controlled using the PFDC register. The prescaler is controlled by the register bits, PRES0

and PRES1. The general counter is programmed by an 8-bit register PFDD. The clock source for the PFD can be se-

lected to be either the 3.58MHz/4 or the 32768Hz oscillator. To enable the PFD output, the PFDEN bit should be set to

1. When the PFD is disabled the PFDD register is inhibited to be written to. To modify the PFDD contents, the PFD must

be enabled. When the generator is disabled, the PFDD is cleared by hardware.

PFD Data Register

Bit No.

Label

R/W

Function

7~0

PFD data register

PFDD (2FH) Register

PFD_Output_Frequency=

Prescaler_ Output

2x(N 1)

, where N = the value of the PFD Data

P r e s c a l e r

O u t p u t

P F D D

P R E S 1 , P R E S 0

3 2 7 6 8 H z

3 . 5 8 M H z / 4

P F D E N

P F D

O u t p u t

M U S I C

B u z z e r

P F D C R e g i s t e r

b 0

N o t i m p l e m e n t e d , r e a d a s " 0 "

b 7

P F D O u t p u t E n a b l e

1 : e n a b l e

0 : d i s a b l e

P F D P r e s c a l e r S e l e c t

0 0 : P r e s c a l e r o u t p u t = P F D f r e q u e n c y s o u r c e / 1

0 1 : P r e s c a l e r o u t p u t = P F D f r e q u e n c y s o u r c e / 2

1 0 : P r e s c a l e r o u t p u t = P F D f r e q u e n c y s o u r c e / 4

1 1 : P r e s c a l e r o u t p u t = P F D f r e q u e n c y s o u r c e / 8

P F D F r e q u e n c y S o u r c e S e l e c t

1 : 3 . 5 8 M H z / 4

0 : 3 2 7 6 8 H z

F P F D

P R E S 1 P R E S 0 P F D E N

HT95R64 Datasheet(PDF) 63 Page - Holtek Semiconductor Inc

HT95R64 Datasheet(HTML) 63 Page - Holtek Semiconductor Inc

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