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HD6432351 Datasheet(PDF) 572 Page - Renesas Technology Corp |
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HD6432351 Datasheet(HTML) 572 Page - Renesas Technology Corp |
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572 / 1025 page  Section 12 Watchdog Timer (WDT) Rev. 3.00 Sep 15, 2006 page 538 of 988 REJ09B0330-0300 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 to. The procedures for writing to and reading these registers are given below. Writing to TCNT and TCSR These registers must be written to by a word transfer instruction. They cannot be written to with byte instructions. Figure 12.2 shows the format of data written to TCNT and TCSR. TCNT and TCSR both have the same write address. For a write to TCNT, the upper byte of the written word must contain H'5A and the lower byte must contain the write data. For a write to TCSR, the upper byte of the written word must contain H'A5 and the lower byte must contain the write data. This transfers the write data from the lower byte to TCNT or TCSR. TCNT write TCSR write Address: H'FFBC Address: H'FFBC H'5A Write data 15 8 7 0 H'A5 Write data 15 8 7 0 Figure 12.2 Format of Data Written to TCNT and TCSR |
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