HT45R37 datasheet(69/100 Pages) HOLTEK

69 / 100 page

HT45R37

Rev. 1.10

January 29, 2010

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

Oscillator Options

High Frequency Oscillator type selection

1. External Crystal Oscillator

2. External RC Oscillator

3. Internal RC Oscillator

4. Externally supplied clock

fSL and fSUB clock selection (Low frequency oscillator type selection)

1. 32768Hz External Oscillator

2. 32K_INT Internal Oscillator

Internal RC Oscillator frequency select:

4MHz, 8MHz or 12MHz

4fS clock selection: fSUB or fSYS/4

XTAL mode selection: 455kHz or 1M~12MHz

Fast wake-up from HALT mode (Only for external crystal oscillator): enable/disable

Reset Option

Rest pin Function: PC0 or Reset Pin

PFD Options

PA3: normal I/O or PFD output

PFD clock selection: Timer/Event Counter 0 or Timer/Event Counter 1

Buzzer Options

PA0/PA1: normal I/O or BZ/BZ or PA0=BZ and PA1 as normal I/O

Buzzer frequency: fS/2

2,f

S/2

3,f

S/2

4,f

S/2

5,f

S/2

6,f

S/2

7,f

S/2

8,f

S/2

Time Base Option

Time base time-out period: 2

12/f

S,2

13/f

S,2

14/f

S,2

15/f

Watchdog Options

Watchdog Timer function: enable or disable

CLRWDT instructions: 1 or 2 instructions

WDT time-out period: 2

12/f

S~2

13/f

S,2

13/f

S~2

14/f

S,2

14/f

S~2

15/f

S,2

15/f

S~2

16/f

LVD/LVR Options

LVD function: enable or disable

LVR function: enable or disable

LVR/LVD voltage: 2.1V/2.2V or 3.15V/3.3V or 4.2V/4.4V

SPI Options

SIM interface enable/disable

SPI_WCOL: enable/disable

SPI_CSEN: enable/disable, used to enable/disable (1/0) software CSEN function

2C Option

2C debounce Time: no debounce, 1 system clock debounce, 2 system clock debounce

HT45R37 Datasheet(PDF) 69 Page - Holtek Semiconductor Inc

HT45R37 Datasheet(HTML) 69 Page - Holtek Semiconductor Inc

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