HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 335
HD6417144
Manufacturer Part Number
HD6417144
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417144.pdf
(930 pages)
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11.
Multi-Function Timer Pulse Unit (MTU)
2. Register Operation:
In complementary PWM mode, nine registers are used, comprising compare registers, buffer
registers, and temporary registers. Figure 11.35 shows an example of complementary PWM
mode operation.
The registers which are constantly compared with the counters to perform PWM output are
TGRB_3, TGRA_4, and TGRB_4. When these registers match the counter, the value set in
bits OLSN and OLSP in the timer output control register (TOCR) is output.
The buffer registers for these compare registers are TGRD_3, TGRC_4, and TGRD_4.
Between a buffer register and compare register there is a temporary register. The temporary
registers cannot be accessed by the CPU.
Data in a compare register is changed by writing the new data to the corresponding buffer
register. The buffer registers can be read or written at any time.
The data written to a buffer register is constantly transferred to the temporary register in the Ta
interval. Data is not transferred to the temporary register in the Tb interval. Data written to a
buffer register in this interval is transferred to the temporary register at the end of the Tb
interval.
The value transferred to a temporary register is transferred to the compare register when
TCNTS for which the Tb interval ends matches TGRA_3 when counting up, or H'0000 when
counting down. The timing for transfer from the temporary register to the compare register can
be selected with bits MD3 to MD0 in the timer mode register (TMDR). Figure 11.35 shows an
example in which the mode is selected in which the change is made in the trough.
In the tb interval (tb1 in figure 11.35) in which data transfer to the temporary register is not
performed, the temporary register has the same function as the compare register, and is
compared with the counter. In this interval, therefore, there are two compare match registers
for one-phase output, with the compare register containing the pre-change data, and the
temporary register containing the new data. In this interval, the three counters—TCNT_3,
TCNT_4, and TCNTS—and two registers—compare register and temporary register—are
compared, and PWM output controlled accordingly.
Rev.4.00 Mar. 27, 2008 Page 291 of 882
REJ09B0108-0400
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