HT48R064 datasheet(22/93 Pages) HOLTEK

22 / 93 page

HT48R063/064/065/066/0662/067

Rev. 1.10

June 9, 2009

System Control Registers

- CTRL0, CTRL1, CTRL2

These registers are used to provide control over various internal functions. Some of these include the PFD control,

PWM control, certain system clock options, the LXT Oscillator low power control, external Interrupt edge trigger type,

Watchdog Timer enable function, Time Base function division ratio, and the LXT oscillator enable control.

· CTRL0 Register

¨ HT48R063/HT48R064/HT48R065

Bit

76543210

Name

¾¾¾¾

PFDEN1

PFDEN0

LXTLP

CLKMOD

R/W

¾¾¾¾

R/W

POR

¾¾¾¾

0000

¨ HT48R066

Bit

76543210

Name

PFDCS

¾¾

PFDEN1

PFDEN0

LXTLP

CLKMOD

R/W

¾¾

R/W

POR

¾¾

0000

Bit 7, 5, 4

Unimplemented, read as

²0²

Bit 6

PFDCS: PFD clock source

0: timer0

1: timer1

Bit 3,2

PFDEN1, PFDEN0: PFD/PFD enable/disable

00: both disables

01: Reserved

10: PFD enable

11: PFD and PFD both enabled

when PFD or PFD is disabled, the related pin will have a normal I/O function.

Bit 1

LXTLP: LXT oscillator low power control function

0: LXT Oscillator quick start-up mode

1: LXT Oscillator Low Power Mode

Bit 0

CLKMOD: system clock mode selection.

0: High speed - HIRC used as system clock

1: Low speed - LXT used as system clock, HIRC oscillator stopped.

For HT48R063/064/065/066, these selections are only valid if the oscillator configuration options

have selected the HIRC+LXT.

HT48R064 Datasheet(PDF) 22 Page - Holtek Semiconductor Inc

HT48R064 Datasheet(HTML) 22 Page - Holtek Semiconductor Inc

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