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12.3.2
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 12.4 ,12.5, and 12.6).
TCR
Bus
interface
Upper 8 bits
Lower 8 bits
Bus master
Internal data bus
Module data bus
Figure 12.4 8-Bit Register Access Operation (Bus Master
↔
TCR (Upper 8 Bits))
TMDR
Bus
interface
Upper 8 bits
Lower 8 bits
Bus master
Internal data bus
Module data bus
Figure 12.5 8-Bit Register Access Operation (Bus Master
↔
TMDR (Lower 8 Bits))
TCR
TMDR
Bus
interface
Upper 8 bits
Lower 8 bits
Bus master
Internal data bus
Module data bus
Figure 12.6 8-Bit Register Access Operation (Bus Master
↔
TCR, TMDR (16 Bit))
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