gc80c520a CORERIVER Semiconductor, gc80c520a Datasheet - Page 77

• Manufacturer Part Number: gc80c520a
• Description: Midas1.0 Family Mask Rom/eprom/romless 8-bit Turbo Microcontrollers
• Manufacturer: CORERIVER Semiconductor

7 Strong Points
7.1 Reduction of noise influence
The MiDAS1.0 family can reduce noise by inhibiting the ALE signal. To do so, set the ALEOFF
bit(PMR.2) to 1.
System Clock
11.0592
22.1184
[MHz]
MiDAS1.0 : ALE “ON”
6
MiDAS1.0 Family
Power Noise
GND Noise
Ground
Ground
Ground
464 mV
476 mV
Power
Power
Power
Noise
PP
PP
Table 7-1 The comparison table of noise reduction
410 mV
550 mV
464 mV
476 mV
360 mV
500 mV
ALE ON
Figure 7-1 Noise reduction
MiDAS1.0 : ALE “OFF”
PP
PP
PP
PP
PP
PP
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MiDAS1.0
Power Noise
GND Noise
280 mV
128 mV
PP
PP
170 mV
330 mV
128 mV
280 mV
170 mV
330 mV
ALE OFF
PP
PP
PP
PP
PP
PP
Company A’s 80C52
Company A’s 80C52
ALE ON (always)
Power Noise
GND Noise
360 mV
500 mV
432 mV
640 mV
380 mV
480 mV
432 mV
660 mV
PP
PP
PP
PP
PP
PP
PP
PP