HT85F2270 datasheet(65/226 Pages) HOLTEK

65 / 226 page

Rev. 1.00

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

PLL Control Register – PLLCR

SFR Address: EDh

Bit

Name

PLLEN

PLLRDY

—

PLLSRC

—

PLL��

PLL�1

PLL�0

R/W

—

R/W

—

R/W

POR

—

Bit 7

PLLEN: PLL enable/disable control

0: PLL disable

1: PLL enable

Bit 6

PLLRDY: PLL output ready indication flag

0: Not ready

1: Ready

After the PLL is enabled this bit is used to indicate when the PLL is locked and ready

for use. This bit will be initially cleared to zero by hardware when the device is powered

on. The bit will be cleared to zero if the PLL is in use and is then disabled but will not

be cleared if the PLL changes frequency.

Bit 5

Unimplemented, read as “0”

Bit 4

PLLSRC: PLL Clock Source Select

0: HIRC clock source

1: HXT clock source

Note that if the PLL clock source is selected to be the external oscillator, HXT, the

crystal frequency should be 4MHz.

Bit 3

Unimplemented, read as “0”

Bit 2~0

PLLM2, PLLM1, PLLM0: PLL Frequency Multiplier select

000: ×1

001: ×2

010: ×3

011: ×4

100: ×5

101: ×6

110: ×7

111: ×8

HT85F2270 Datasheet(PDF) 65 Page - Holtek Semiconductor Inc

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