Hitachi H8/3637 Hardware Manual page 207

When reading the upper byte
CPU
[H'AA]
When reading the lower byte
CPU
[H'FF]
Note: * Becomes H'AB00 if counter is incremented once.
202
Bus
interface
Bus
interface
Figure 9.17 TCY Read Operation (TCY → CPU)
Module internal data bus
TEMP
[H'FF]
TCYH
[H'AA]
Module internal data bus
TEMP
[H'FF]
TCYH
[AB]
*
TCYL
[H'FF]
TCYL
[00]
*