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H8/3028F Datasheet(PDF) 419 Page - Renesas Technology Corp |
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H8/3028F Datasheet(HTML) 419 Page - Renesas Technology Corp |
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419 / 923 page  Rev. 2.00, 09/03, page 389 of 890 10.3 CPU Interface 10.3.1 8-Bit Registers 8TCNT, TCORA, TCORB, 8TCR, and 8TCSR are 8-bit registers. These registers are connected to the CPU by an internal 16-bit data bus and can be read and written a word at a time or a byte at a time. Figures 10.2 and 10.3 show the operation in word read and write accesses to 8TCNT. Figures 10.4 to 10.7 show the operation in byte read and write accesses to 8TCNT0 and 8TCNT1. 8TCNT0 8TCNT1 H L H L C P U Internal data bus Bus interface Module data bus Figure 10.2 8TCNT Access Operation (CPU Writes to 8TCNT, Word) 8TCNT0 8TCNT1 H L H L C P U Internal data bus Bus interface Module data bus Figure 10.3 8TCNT Access Operation (CPU Reads 8TCNT, Word) 8TCNTH0 8TCNTL1 H L H L C P U Internal data bus Bus interface Module data bus Figure 10.4 8TCNT0 Access Operation (CPU Writes to 8TCNT0, Upper Byte) |
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