When writing the upper byte
CPU
[H'AA]
When writing the lower byte
CPU
[H'55]
Figure 9.3 TCF Write Operation (CPU → TCF)
Bus
interface
Bus
interface
Internal data bus
TEMP
[H'AA]
TCFH
[
]
Internal data bus
TEMP
[H'AA]
TCFH
[H'AA]
TCFL
[
]
TCFL
[H'55]
175