UPD78F0138 NEC, UPD78F0138 Datasheet - Page 227

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

<1> When TMHE1 = 0 and TCE51 = 0, 8-bit timer counter H1 operation is stopped.
<2> When TMHE1 = 1 is set, 8-bit timer counter H1 starts a count operation. At that time, the carrier clock is held
<3> When the count value of 8-bit timer counter H1 matches the CMP01 register value, the first INTTMH1 signal
<4> When the count value of 8-bit timer counter H1 matches the CMP11 register value, the INTTMH1 signal is
<5> When the INTTM51 signal is generated, it is synchronized with 8-bit timer H1 count clock and output as the
<6> The INTTM5H1 signal becomes the data transfer signal for the NRZB1 bit, and the NRZB1 bit value is
<7> When NRZ1 = 0 is set, the TOH1 output becomes low level.
at the inactive level.
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.
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 fixed to 50% is generated.
INTTM5H1 signal.
transferred to the NRZ1 bit.
8-bit timer counter
TM5n count value
Hn count value
8-bit timer Hn
Carrier clock
8-bit timer 5n
Carrier clock
count clock
count clock
INTTM5Hn
INTTMHn
INTTM5n
TMHEn
CMPn0
CMPn1
NRZBn
TCE5n
NRZn
CR5n
TOHn
Figure 8-15. Carrier Generator Mode Operation Timing (1/3)
<1> <2>
00H
00H 01H
(a) Operation when CMP01 = N, CMP11 = N
0
CHAPTER 8 8-BIT TIMERS H0 AND H1
0
N 00H
User’s Manual U16228EJ2V0UD
<3>
L
1
00H 01H
<5>
N 00H
<4>
1
<6>
L 00H 01H
0
N 00H
<7>
N
N
L
0
N 00H
L 00H 01H
1
1
N 00H
L
0
00H 01H
0
N
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