HD6437101 RENESAS [Renesas Technology Corp], HD6437101 Datasheet - Page 225

• Manufacturer Part Number: HD6437101
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Register Operation: In complementary PWM mode, nine registers are used, comprising compare
registers, buffer registers, and temporary registers. Figure 8.35 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 8.35 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 8.35) 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
Counter value
TGRA_3
H'0000
TCDR
TDDR
Figure 8.34 Complementary PWM Mode Counter Operation
TCNT_4
TCNTS
TCNT_3
Section 8 Multifunction Timer Pulse Unit (MTU)
Rev.1.00 Sep. 18, 2008 Page 191 of 522
TCNT_3
TCNT_4
TCNTS
REJ09B0069-0100
Time