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SH7014 Datasheet(PDF) 258 Page - Renesas Technology Corp |
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SH7014 Datasheet(HTML) 258 Page - Renesas Technology Corp |
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258 / 754 page  10. Multifunction Timer Pulse Unit (MTU) Rev.5.00 Sep. 27, 2007 Page 224 of 716 REJ09B0398-0500 10.3 Bus Master Interface 10.3.1 16-Bit Registers The timer counters (TCNT) and general registers (TGR) are 16-bit registers. A 16-bit data bus to the bus master enables 16-bit read/writes. 8-bit read/write is not possible. Always access in 16-bit units. Figure 10.2 shows an example of 16-bit register access operation. TCNTH TCNTL Bus interface Upper 8 bits Lower 8 bits Bus master Internal data bus Module data bus Figure 10.2 16-Bit Register Access Operation (Bus Master ↔ TCNT (16 Bit)) 10.3.2 8-Bit Registers All registers other than the TCNT and general registers (TGR) are 8-bit registers. These are connected to the CPU by a 16-bit data bus, so 16-bit read/writes and as 8-bit read/writes are both possible (figures 10.3 to 10.5). TCR Bus interface Upper 8 bits Lower 8 bits Bus master Internal data bus Module data bus Figure 10.3 8-Bit Register Access Operation (Bus Master ↔ TCR (Upper 8 Bits)) |
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