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H8/3021 Datasheet(PDF) 347 Page - Renesas Technology Corp |
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H8/3021 Datasheet(HTML) 347 Page - Renesas Technology Corp |
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347 / 712 page  10. Watchdog Timer Rev.2.00 Mar. 22, 2007 Page 323 of 684 REJ09B0352-0200 10.2.4 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 10.2 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. 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. Figure 10.2 Format of Data Written to TCNT and TCSR |
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