HT46R0664 datasheet(24/92 Pages) HOLTEK

24 / 92 page

Rev. 1.00

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HT46R0664

Enhanced A/D+LCD Type 8-Bit OTP MCU

Bit 1

AC: Auxiliary flag

0: no auxiliary carry

1: an operation results in a carry out of the low nibbles in addition, or no borrow

from the high nibble into the low nibble in subtraction

Bit 0

C: Carry flag

0: no carry-out

1: an operation results in a carry during an addition operation or if a borrowing does

not take place during a subtraction operation C is also affected by a rotate through

carry instruction

System Control Registers – CTRL0, CTRL1, CTRL2, CTRL3, CTRL4

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,

buzzer function control, LCD driver clock selection, Timer clock source selection, Time Base

functions division ratio, and the LXT oscillator enable control.

CTRL0 Register

Bit

Name

PCFG

PFDCS PWMSEL PWMC1 PWMC0

PFDC

—

CLKMOD

R/W

—

R/W

POR

—

Bit 7

PCFG: PA2~PA1 pin-shared function Pin Remapping Control

0: TC1/TC0 pin-shared with PA1/PA2

1: TC1/TC0 pin-shared with PA2/PA1

Bit 6

PFDCS: PFD clock source

0: timer0

1: timer1

Bit 5

PWMSEL: PWM type selection

0: 6+2

1: 7+1

This bit can be clear to “0”, but can not set to “1”.

Bit 4

PWMC1: I/O or PWM1

0: I/O

1: PWM1

Bit 3

PWMC0: I/O or PWM0

0: I/O

1: PWM0

Bit 2

PFDC: I/O or PFD

0: I/O

1: PFD

Bit 1

Unimplemented, read as “0”

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

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