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HT56R656 数据表(PDF) 89 Page - Holtek Semiconductor Inc |
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HT56R656 数据表(HTML) 89 Page - Holtek Semiconductor Inc |
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89 / 108 page  HT56R62/HT56R65 HT56R642/HT56R644/HT56R654/HT56R656 Rev. 1.00 89 July 20, 2009 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 1 High Oscillator type selection - f M 1. External Crystal Oscillator 2. External RC Oscillator 3. Externally supplied clock - internal filter on 4. Externally supplied clock - internal filter off 2 fSUB clock selection: 1. 32768Hz External Oscillator 2. 32K_INT Internal Oscillator 3fS clock selection: fSUB or fSYS/4 4 XTAL mode selection: 455kHz or 1M~12MHz 5 32768Hz Crystal: enable or disable PFD Options 6 PA3: normal I/O or PFD output 7 PFD clock selection: Timer/Event Counter 0 or Timer/Event Counter 1 Buzzer Options 8 PA0/PA1: normal I/O or BZ/BZ or PA0=BZ and PA1 as normal I/O 9 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 9 Time Base Option 10 Time base time-out period: 2 12/f S,2 13/f S,2 14/f S,2 15/f S, LCD Option 11 LCD type: R or C - HT56R62/HT56R65 only Watchdog Options 12 Watchdog Timer function: enable or disable 13 CLRWDT instructions: 1 or 2 instructions 14 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 S LVD/LVR Options 15 LVD function: enable or disable 16 LVR function: enable or disable 17 LVR/LVD voltage: 2.1V/2.2V or 3.15V/3.3V or 4.2V/4.4V SPI Options 18 SIM pin enable/disable 19 SPI_WCOL: enable/disable 20 SPI_CSEN: enable/disable, used to enable/disable (1/0) software CSEN function |
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