Fujitsu FR60 Hardware Manual page 279

■ Reload and Compare Functions
The 8/16-bit up/down counters/timers have reload and compare clear functions, which can be combined for
processing. Table 6.1-3 presents examples of selecting the reload and compare clear functions.
Table 6.1-3 Selecting the Reload and Compare Clear Functions
RLDE, UCRE
00
01
10
11
●
When the Reload Function is Enabled
When the reload function is started, the value of the RCR is transferred to the UDCR with the timing of the
down count clock after an underflow. In this case, when UDFF is set, an interrupt request is generated.
In a mode in which down counting is not performed, starting this function is invalid.
Figure 6.1-5 shows an overview of reload function operation.
Figure 6.1-5 Overview of the Operation of the Reload Function
(0FFFF )
H
0FF
H
RCR
00
H
Disables clear by reload/compare (initial value).
B
Enables clear by compare.
B
Enables reload.
B
Enables clear by reload/compare.
B
Reload, interrupt occur.
Underflow
Reload/compare function
Reload, interrupt occur.
Underflow
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