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SM39R08A5 Folha de dados(PDF) 10 Page - SyncMOS Technologies,Inc |
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SM39R08A5 Folha de dados(HTML) 10 Page - SyncMOS Technologies,Inc |
10 / 58 page SM39R08A5 8-Bit Micro-controller with 8KB Flash & 256B RAM embedded Specifications subject to change without notice contact your sales representatives for the most recent information. ISSFD-M067 Ver E SM39R08A5 06/30/2015 - 10 - Function Description 1. General Features SM39R08A5 is an 8-bit micro-controller. All of its functions and the detailed meanings of SFR will be given in the following sections. 1.1. Embedded Flash The program can be loaded into the embedded 8KB Flash memory via its writer. The high-quality Flash suitable for re-programming and data recording as EEPROM. 1.2. IO Pads The SM39R08A5 has an I/O port: Port 3. Port 3 is 8-bit port. These are: quasi-bidirectional (standard 8051 port outputs), push-pull, open drain, and input-only. As described in section 5. The RESET Pin can be configured as I/O port P3.6, when the user uses on-chip hardware RESET mechanism. 1.3. Instruction timing Selection The conventional 52-series MCUs are 12T, i.e., 12 oscillator clocks per machine cycle. SM39R08A5 is a 1T to 8T MCU, i.e., its machine cycle is one-clock to eight-clock. In the other words, it can execute one instruction within one clock to only eight clocks. Mnemonic: CKCON Address: 8Eh 7 6 5 4 3 2 1 0 Reset - ITS - - CLKOUT 10H ITS: Instruction timing select. ITS [6:4] Instruction timing 000 1T mode 001 2T mode (default) 010 3T mode 011 4T mode 100 5T mode 101 6T mode 110 7T mode 111 8T mode The default is in 2T mode, and it can be changed to another Instruction timing mode if CKCON [6:4] (at address 8Eh) is change any time. Not every instruction can be executed with one machine cycle. The exact machine cycle number for all the instructions are given in the next section. |
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