Renesas SH7641 - Manual (Page 624)

Section 18 Multi-Function Timer Pulse Unit (MTU)
Rev. 4.00 Sep. 14, 2005 Page 574 of 982
REJ09B0023-0400
TCNT value
H'09FB
H'0000
TGRC
Time
H'0532
TIOCA
TGRA H'0F07 H'0532
H'0F07
H'0532
H'0F07
H'09FB
Figure 18.17 Example of Buffer Operation (2)
18.4.4 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 counter clock upon overflow/underflow of
TCNT_2 as set in bits TPSC0 to TPSC2 in TCR.
Underflow occurs only when the lower 16-bit TCNT is in phase-counting mode.
Table 18.30 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 18.30 Cascaded Combinations
Combination Upper 16 Bits Lower 16 Bits
Channels 1 and 2 TCNT_1 TCNT_2