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EM78452 Datasheet(PDF) 8 Page - ELAN Microelectronics Corp |
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EM78452 Datasheet(HTML) 8 Page - ELAN Microelectronics Corp |
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8 / 54 page  EM78452 8-Bit Microcontroller 4 • Product Specification (V1.0) 10.18.2007 (This specification is subject to change without further notice) 5 Function Description IOC5 R5 P 5 0 P 5 1 P 5 2 P 5 3 P 5 4 P 5 5 P 5 6 P 5 7 IOC6 R6 P 6 0 P 6 1 P 6 2 P 6 3 P 6 4 P 6 5 P 6 6 P 6 7 IOC7 R7 P 7 0 P 7 1 P 7 2 IOC8 R8 P 8 0 P 8 1 P 8 2 P 8 3 P 8 4 P 8 5 P 8 6 P 8 7 IOC9 R9 P 9 0 P 5 5 / / S S SPI ENGIN TMR1 ACC R3 STACK 1 STACK 2 STACK 3 STACK 4 STACK 5 P C ROM Instruction Register Instruction Decoder ALU Interrupt Control /INT R4 RAM WDT Timer Prescaler Oscillator/ Timming Control WDT Time-out R1(TCC) Sleep & Wake Up Control DATA & CONTROL BUS P 9 4 / S C K P 9 3 / S D O P 9 2 / S D I P 9 1 / S R D Y Fig. 5-1 Functional Block Diagram 5.1 Operational Registers 5.1.1 R0 (Indirect Address Register) R0 is not a physically implemented register. It is used as an indirect addressing pointer. Any instruction using R0 as register actually accesses data pointed by the RAM Select Register (R4). 5.1.2 R1 (TCC) R1 is incremented by the instruction cycle clock. It is written and read by the program as any other register. 5.1.3 R2 (Program Counter) & Stack R2 and the hardware stacks are 12 bits wide. The structure is depicted in Fig. 5-2. Generates 4K × 13 on-chip ROM addresses to the relative programming instruction codes. One program page is 1024 words long. All the R2 bits are set to "1"s as a reset condition occurs. |
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