HD6412340 HITACHI [Hitachi Semiconductor], HD6412340 Datasheet - Page 353
HD6412340
Manufacturer Part Number
HD6412340
Description
H8S/2345 F-ZTAT Hardware Manual
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6412340.pdf
(907 pages)
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9.4.5
In cascaded operation, two 16-bit counters for different channels are used together as a 32-bit
counter.
This function works by counting the channel 1 (channel 4) counter clock upon overflow/underflow
of TCNT2 (TCNT5) as set in bits TPSC2 to TPSC0 in TCR.
Underflow occurs only when the lower 16-bit TCNT is in phase-counting mode.
Table 9.6 shows the register combinations used in cascaded operation.
Note: When phase counting mode is set for channel 1 or 4, the counter clock setting is invalid
Table 9.6
Combination
Channels 1 and 2
Channels 4 and 5
Example of Cascaded Operation Setting Procedure: Figure 9.21 shows an example of the
setting procedure for cascaded operation.
336
and the counter operates independently in phase counting mode.
<Cascaded operation>
Cascaded operation
Cascaded Operation
Set cascading
Cascaded Combinations
Start count
Figure 9.21 Cascaded Operation Setting Procedure
Upper 16 Bits
TCNT1
TCNT4
[1]
[2]
[1] Set bits TPSC2 to TPSC0 in the channel 1
[2] Set the CST bit in TSTR for the upper and lower
(channel 4) TCR to B’111 to select TCNT2
(TCNT5) overflow/underflow counting.
channel to 1 to start the count operation.
Lower 16 Bits
TCNT2
TCNT5
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