UPD78F0537DGA(T)-9EV-A NEC, UPD78F0537DGA(T)-9EV-A Datasheet - Page 292

• Manufacturer Part Number: UPD78F0537DGA(T)-9EV-A
• Description: 8BIT MCU, 128K FLASH, 7KB RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F0537DGA(T)-9EV-A

• Controller Family/series: UPD78
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 8
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

<R>
292
<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
<3> When the count value of the 8-bit timer counter H1 matches the CMP01 register value, the first INTTMH1
<4> When the count value of the 8-bit timer counter H1 matches the CMP11 register value, the INTTMH1 signal
<5> When the INTTM51 signal is generated, it is synchronized with the 8-bit timer H1 count clock and is output as
<6> A carrier signal is output at the first rising edge of the carrier clock if NRZ1 is set to 1.
<7> When NRZ1 = 0, the TOH1 output is held at the high level and is not changed to low level while the carrier
Remark INTTM5H1 is an internal signal and not an interrupt source.
remains default.
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.
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 other than 50%
is generated.
the INTTM5H1 signal.
clock is high level (from <6> and <7>, the high-level width of the carrier clock waveform is guaranteed).
8-bit timer counter
TM51 count value
H1 count value
8-bit timer H1
Carrier clock
8-bit timer 51
Carrier clock
count clock
INTTM5H1
count clock
INTTMH1
INTTM51
TMHE1
CMP01
CMP11
NRZB1
TCE51
NRZ1
CR51
TOH1
Figure 9-15. Carrier Generator Mode Operation Timing (2/3)
<1><2>
00H
00H 01H
0
(b) Operation when CMP01 = N, CMP11 = M
CHAPTER 9 8-BIT TIMERS H0 AND H1
K
0
N 00H 01H
<3>
User’s Manual U17260EJ6V0UD
K 00H 01H
1
<6>
<5>
1
M 00H
<4>
L
L 00H 01H
0
<7>
N
M
N 00H 01H
0
M 00H 01H
M
1
M 00H
1
N
0
00H 01H
N
N
00H
0