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TMP88CS42FG Datasheet(PDF) 20 Page - Toshiba Semiconductor |
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TMP88CS42FG Datasheet(HTML) 20 Page - Toshiba Semiconductor |
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20 / 216 page  Page 10 2. Functional Description 2.1 Functions of the CPU Core TMP88CS42FG 2.1.2 Program Memory (ROM) The TMP88CS42FG contains 64Kbytes program memory (MaskROM) located at addresses 04000H to 13EFFH and addresses FFF00H to FFFFFH. 2.1.3 Data Memory (RAM) The TMP88CS42FG contains 2Kbytes +128bytes RAM. The first 128bytes location (00040H to 000BFH) of the internal RAM is shared with a general-purpose register bank. The content of the data memory is indeterminate at power-on, so be sure to initialize it in the initialize rou- tine. Note:Because general-purpose registers exist in the RAM, never clear the current bank address of RAM. In the above example, the RAM is cleared except bank 0. Example :Clearing the internal RAM of the TMP88CS42FG (clear all RAM addresses to 0, except bank 0) LD HL, 0048H ; Set the start address LD A, 00H ; Set the initialization data (00H) LD BC, 877H ; Set byte counts (-1) SRAMCLR: LD (HL+), A DEC BC JRS F, SRAMCLR |
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