Renesas H8 Series Hardware Manual

Section 9 Timers
Rev. 7.00 Mar 10, 2005 page 273 of 652
REJ09B0042-0700
Read Access
In access to TCF, when the upper byte is read the upper-byte data is transferred directly to the
CPU and the lower-byte data is transferred to TEMP. Next, when the lower byte is read, the
lower-byte data in TEMP is transferred to the CPU.
In access to OCRF, when the upper byte is read the upper-byte data is transferred directly to the
CPU. When the lower byte is read, the lower-byte data is transferred directly to the CPU.
Figure 9.5 shows an example in which TCF is read when it contains H'AAFF.
Read upper byte
CPU
(H'AA)
TEMP
(H'FF)
TCFH
(H'AA)
TCFL
(H'FF)
Bus
interface
Module data bus
Read lower byte
CPU
(H'FF)
TEMP
(H'FF)
TCFH
(AB)
*
TCFL
(00)
*
Bus
interface
Module data bus
Note: * H'AB00 if counter has been updated once.
Figure 9.5 Read Access to TCF (TCF →
→→
→ CPU)

Renesas H8 Series Specifications

General

Brand	Renesas
Model	H8 Series
Category	Computer Hardware
Language	English