HT46R46 datasheet(45/77 Pages) HOLTEK

45 / 77 page

Application Circuits

HT46R46/C46/R47/C47/R48A/C48A/R49

Rev. 1.30

June 5, 2008

P D 0 / P W M

P B 0 / A N 0 ~ P B 3 / A N 3

P B 4 ~ P B 7

P A 0 ~ P A 2

P A 3 / P F D

P A 4 / T M R

P A 5 / I N T

P A 6 ~ P A 7

P C 0 ~ P C 1

P C 2 ~ P C 4

R E S

0 . 1 m F

1 0 0 k W

V D D

V S S

0 . 1 m F

V D D

R e s e t

C i r c u i t

O S C 1

O S C 2

O S C

C i r c u i t

S e e O s c i l l a t o r

S e c t i o n

Configuration Options

Configuration options refer to certain options within the MCU that are programmed into the device during the program-

ming process. During the development process, these options are selected using the HT-IDE software development

tools. As these options are programmed into the device using the hardware programming tools, once they are selected

they cannot be changed later as the application software has no control over the configuration options. All options must

be defined for proper system function, the details of which are shown in the table.

No.

Options

Watchdog Timer clock source: WDT oscillator or fSYS/4

Watchdog Timer function: enable or disable

CLRWDT instructions: 1 or 2 instructions

System oscillator: Crystal or RC

PA, PB and PD: pull-high enable or disable

PC: pull-high enable or disable - HT46R48A and HT46R49 only

PWM: enable or disable - Except HT46R49

PWM0, PWM1: enable or disable - HT46R49 only

PA0~PA7: wake-up enable or disable - bit option

PFD: normal I/O or PFD output

LVR function: enable or disable

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