176
Bus
interface
Bus
interface
CPU
[H'AA]
TEMP
(H'FF)
TCFH
[H'AA]
TCFL
[H'FF]
Internal data bus
When reading the upper byte
CPU
[H'FF]
TEMP
[H'FF]
TCFH
[AB]
TCFL
[00]
Internal data bus
When reading the lower byte
*
*
Note:
*
Becomes H'AB00 if counter is incremented once.
Figure 9.4 TCF Read Operation (TCF
→
CPU)