SH7261 Datasheet, PDF (592/1348 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 12 Multi-Function Timer Pulse Unit 2 (MTU2)
12.7.11 Contention between Buffer Register Write and Input Capture
If an input capture signal is generated in the T2 state of a buffer register write cycle, the buffer
operation takes precedence and the write to the buffer register is not performed.
Figure 12.118 shows the timing in this case.
Pφ
Address
Write signal
Input capture
signal
TCNT
Buffer register write cycle
T1 T2
Buffer register
address
N
TGR
Buffer register
M
N
M
Figure 12.118 Contention between Buffer Register Write and Input Capture
12.7.12 TCNT_2 Write and Overflow/Underflow Contention in Cascade Connection
With timer counters TCNT_1 and TCNT_2 in a cascade connection, when a contention occurs
during TCNT_1 count (during a TCNT_2 overflow/underflow) in the T2 state of the TCNT_2
write cycle, the write to TCNT_2 is conducted, and the TCNT_1 count signal is disabled. At this
point, if there is match with TGRA_1 and the TCNT_1 value, a compare signal is issued.
Furthermore, when the TCNT_1 count clock is selected as the input capture source of channel 0,
TGRA_0 to TGRD_0 carry out the input capture operation. In addition, when the compare
match/input capture is selected as the input capture source of TGRB_1, TGRB_1 carries out input
capture operation. The timing is shown in figure 12.119.
For cascade connections, be sure to synchronize settings for channels 1 and 2 when setting TCNT
clearing.
Rev. 2.00 Sep. 07, 2007 Page 560 of 1312
REJ09B0320-0200