Renesas F-ZTAT H8 Series Hardware Manual page 262

9. Timers
Upper byte write
CPU
(H'AA)
Lower byte write
CPU
(H'55)
Read Access: When the upper byte of TCF is read, the upper-byte data is sent directly to the CPU,
and the lower byte is loaded into TEMP. Next when the lower byte is read, the lower byte in
TEMP is sent to the CPU.
Rev.3.00 Jul. 19, 2007 page 236 of 532
REJ09B0397-0300
Figure 9.5 TCF Write Operation (CPU → TCF)
Internal data bus
TEMP
(H'AA)
TCFH TCFL
( ) (
Internal data bus
TEMP
(H'AA)
TCFH TCFL
(H'AA) (H'55)
)