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10.4.4 Cascaded
Operation
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 TCNT_2 (TCNT_5) as set in bits TPSC0 to TPSC2 in TCR.
Underflow occurs only when the lower 16-bit TCNT is in phase-counting mode.
Table 10.29 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
and the counters operates independently in phase counting mode.
Table 10.29 Cascaded Combinations
Combination
Upper 16 Bits
Lower 16 Bits
Channels 1 and 2
TCNT_1
TCNT_2
Channels 4 and 5
TCNT_4
TCNT_5
Example of Cascaded Operation Setting Procedure: Figure 10.17 shows an example of the
setting procedure for cascaded operation.
Cascaded operation
Set cascading
Start count
<Cascaded operation>
Set bits TPSC2 to TPSC0 in the channel 1
(channel 4) TCR to B'1111 to select TCNT_2
(TCNT_5) overflow/underflow counting.
Set the CST bit in TSTR for the upper and lower
channel to 1 to start the count operation.
[1]
[2]
[1]
[2]
Figure 10.17 Cascaded Operation Setting Procedure
Examples of Cascaded Operation: Figure 10.18 illustrates the operation when TCNT_2
overflow/underflow counting has been set for TCNT_1, when TGRA_1 and TGRA_2 have been
designated as input capture registers, and when TIOC pin rising edge has been selected.
When a rising edge is input to the TIOCA1 and TIOCA2 pins simultaneously, the upper 16 bits of
the 32-bit data are transferred to TGRA_1, and the lower 16 bits to TGRA_2.
Содержание H8S/2627
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