CHAPTER 8 8-BIT TIMERS H0 AND H1
Preliminary User’s Manual U16315EJ1V0UD
199
Figure 8-13. Carrier Generator Mode Operation Timing (1/3)
(a) Operation when CMP01 = 1, CMP11 = 1
CMP01
CMP11
TMHE1
INTTMH1
Carrier clock
00H
N
00H
N
00H
N
00H
N
00H
N
00H
N
N
N
8-bit timer 51
count clock
TM51 count value
CR51
TCE51
TOH1
0
0
1
1
0
0
1
1
0
0
INTTM51
NRZB1
NRZ1
Carrier clock
00H 01H
L
00H 01H
L
00H 01H
L
00H 01H
00H 01H
L
L
<1> <2>
<3>
<4>
<5>
<6>
<7>
8-bit timer H1
count clock
8-bit timer counter
H1 count value
<1>
When TMHE1 = 0 and TCE51 = 0, 8-bit timer H1 operation is stopped.
<2>
When TMHE1 = 1 is set, 8-bit timer H1 starts a count operation. At that time, the carrier clock is held at the
inactive level.
<3>
When the count value of 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 8-bit timer
counter H1 is switched from the CMP01 register to the CMP11 register. 8-bit timer counter H1 is cleared to
00H.
<4>
When the count value of 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 8-bit timer
counter H1 is switched from the CMP11 register to the CMP01 register. 8-bit timer counter H1 is cleared to
00H. By performing procedures <3> and <4> repeatedly, a carrier clock with duty ratio fixed to 50% is
generated.
<5>
When the INTTM51 signal is generated, it is synchronized with 8-bit timer H1 count clock and 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.
Содержание 78K0/KD1 Series
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