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H8/3003 Datasheet(PDF) 433 Page - Renesas Technology Corp |
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H8/3003 Datasheet(HTML) 433 Page - Renesas Technology Corp |
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433 / 715 page  12.2.4 Notes on Register Access The watchdog timer’s TCNT, TCSR, and RSTCSR registers differ from other registers in being more difficult to write. The procedures for writing and reading these registers are given below. Writing to TCNT and TCSR: These registers must be written by a word transfer instruction. They cannot be written by byte instructions. Figure 12-2 shows the format of data written to TCNT and TCSR. TCNT and TCSR both have the same write address. The write data must be contained in the lower byte of the written word. The upper byte must contain H'5A (password for TCNT) or H'A5 (password for TCSR). This transfers the write data from the lower byte to TCNT or TCSR. Figure 12-2 Format of Data Written to TCNT and TCSR 15 8 7 0 H'5A Write data Address H'FFA8* 15 8 7 0 H'A5 Write data Address H'FFA8* TCNT write TCSR write Note: Lower 16 bits of the address. * 415 |
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