h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 352

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 11 16-Bit Free-Running Timer
11.6
Application programmers should note that the following types of contention can occur in the free-
running timer.
Contention between FRC Write and Clear: If an internal counter clear signal is generated
during the state after an FRC write cycle, the clear signal takes priority and the write is not
performed.
Figure 11.18 shows this type of contention.
Rev. 4.00 Jun 06, 2006 page 298 of 1004
REJ09B0301-0400
Usage Notes
Address
Internal write
signal
Counter clear
signal
FRC
Figure 11.18 FRC Write-Clear Contention
FRC write cycle
T
1
FRC address
N
T
2
H'0000