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SM39R4051 Datenblatt(PDF) 11 Page - SyncMOS Technologies,Inc |
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SM39R4051 Datenblatt(HTML) 11 Page - SyncMOS Technologies,Inc |
11 / 47 page SM39R4051/SM39R2051 8-Bit Micro-controller 4KB/2KB with ISP Flash & 256B RAM embedded Specifications subject to change without notice contact your sales representatives for the most recent information. ISSFD-M055 11 Ver.E SM39R4051 09/2011 1.4.4. Software Reset register (SWRES) Mnemonic: SWRES Address: E7H 7 6 5 4 3 2 1 0 Reset SWRES [7:0] 00H SWRES [7:0]: Software reset register bit. These 8-bit is self-reset at the end of the reset procedure. SWRES [7:0] = FFh, software reset. SWRES [7:0] = 00h ~ FEh, MCU no action. 1.4.5. Example of software reset MOV TAKEY, #55h MOV TAKEY, #0AAh MOV TAKEY, #5Ah ; enable SWRES write attribute MOV SWRES, #0FFh; software reset MCU 1.5. Clocks The default clock is the external crystal. This clock is used during the initialization stage. The major work of the initialization stage is to determine the clock source used in normal operation. The internal clock sources are from the on-chip RC-Oscillator with programmable frequency outputs as table 1-1,the clock source can set by writer or ICP。 Table 1-1: Selection of clock source Clock source external crystal (use XTAL1 and XTAL2 pins ) (default) external crystal (only use XTAL1, the XTAL2 define as I/O) 20MHz from on-chip RC-Oscillator 16MHz from on-chip RC-Oscillator 12MHz from on-chip RC-Oscillator 8MHz from on-chip RC-Oscillator 4MHz from on-chip RC-Oscillator 2MHz from on-chip RC-Oscillator 1MHz from on-chip RC-Oscillator |
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Ähnliche Beschreibung - SM39R4051 |
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