UPD78F0411GA-GAM-AX Datasheet, PDF (261/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 8 8-BIT TIMERS H0, H1, AND H2
Figure 8-17. Carrier Generator Mode Operation Timing (1/3)
(a) Operation when CMP01 = N, CMP11 = N
8-bit timer H1
count clock
8-bit timer counter
H1 count value ^00H
N 00H
N 00H
N 00H
N 00H
N 00H
N
CMP01
N
CMP11
N
TMHE11
INTTMH1
Carrier clock
<1><2>
8-bit timer 51
count clock
TM51 count value
00H 01H
<3>
<4>
K 00H 01H
L 00H 01H
M 00H 01H
N 00H 01H
CR51
K
L
M
N
TCE51
INTTM51
INTTM5H1
NRZB1
0
NRZ1
Carrier clock
TOH1
<5>
1
0
0
<6>
1
1
0
<7>
0
1
0
<1> When TMHE1 = 0 and TCE51 = 0, the 8-bit timer counter H1 operation is stopped.
<2> When TMHE1 = 1 is set, the 8-bit timer counter H1 starts a count operation. At that time, the carrier clock
remains default.
<3> When the count value of the 8-bit timer counter H1 matches the CMP01 register value, the first INTTMH1
signal is generated, the carrier clock signal is inverted, and the compare register to be compared with the 8-
bit timer counter H1 is switched from the CMP01 register to the CMP11 register. The 8-bit timer counter H1
is cleared to 00H.
<4> When the count value of the 8-bit timer counter H1 matches the CMP11 register value, the INTTMH1 signal
is generated, the carrier clock signal is inverted, and the compare register to be compared with the 8-bit timer
counter H1 is switched from the CMP11 register to the CMP01 register. The 8-bit timer counter H1 is cleared
to 00H. By performing procedures <3> and <4> repeatedly, a carrier clock with duty fixed to 50% is
generated.
<5> When the INTTM51 signal is generated, it is synchronized with the 8-bit timer H1 count clock and is output as
the INTTM5H1 signal.
<6> The INTTM5H1 signal becomes the data transfer signal for the NRZB1 bit, and the NRZB1 bit value is
transferred to the NRZ1 bit.
<7> When NRZ1 = 0 is set, the TOH1 output becomes low level.
Remark INTTM5H1 is an internal signal and not an interrupt source.
User’s Manual U18698EJ1V0UD
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