HT48R02B datasheet(53/71 Pages) HOLTEK

53 / 71 page

Application Circuits

HT46R01B/02B/01N/02N

HT48R01B/02B/01N/02N

Rev.1.00

December 15, 2009

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

P A 0 / A N 0

P A 1 / P F D / A N 1

P A 2 / T C 0 / A N 2

P A 3 / I N T / A N 3

P A 4 / T C 1 / P W M 0

P B 0

P B 1

R E S / P A 7

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

0 . 1 ~ 1 m F

1 0 k W ~

1 0 0 k W

3 0 0 W

0 . 0 1 m F

1 N 4 1 4 8

Configuration Options

Configuration options refer to certain options within the MCU that are programmed into the OTP Program Memory de-

vice during the programming 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 by the application software. All options must be defined for proper

system function, the details of which are shown in the table.

No.

Options

Watchdog Timer: enable or disable

Watchdog Timer clock source: LXT, LIRC or fSYS/4

Note: LXT oscillator must be selected by OSC configuration option if WDT clock source is from LXT.

CLRWDT instructions: 1 or 2 instructions

System oscillator configuration: HXT, HIRC, ERC, HIRC + LXT

LVR function: enable or disable

LVR voltage: 2.1V, 3.15V or 4.2V

RES or PA7 pin function

SST: 1024 or 2 clocks (determine tSST for HIRC/ERC)

Internal RC: 4MHz, 8MHz or 12MHz

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