hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 315

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

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
Read lower byte
Note: * H'AB00 if counter has been updated once.
(H'AA)
(H'FF)
CPU
CPU
Figure 9.5 Read Access to TCF (TCF → → → → CPU)
Bus
interface
Bus
interface
(H'AA)
TCFH
TCFH
(AB) *
Rev. 7.00 Mar 10, 2005 page 273 of 652
TEMP
(H'FF)
TEMP
(H'FF)
Module data bus
Module data bus
(H'FF)
TCFL
TCFL
(00) *
REJ09B0042-0700
Section 9 Timers