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DS87C530/DS83C530 EPROM/ROM Microcontrollers with Real-Time Clock
4 of 47
Figure 1. Block Diagram
PIN DESCRIPTION
PIN
PLCC TQFP
NAME FUNCTION
52 45 V
CC
+5V Processor Power Supply
1, 25 18, 46 GND
Processor Digital Circuit Ground
29 22 V
CC2
+5V RTC Supply. V
CC2
is isolated from V
CC
to isolate the RTC from digital noise.
26 19 GND2
RTC Circuit Ground
12 5 RST
Reset Input. This pin contains a Schmitt voltage input to recognize external active
high reset inputs. The pin also employs an internal pulldown resistor to allow for a
combination of wired OR external reset sources. An RC is not required for power-up,
as the device provides this function internally.
23 16 XTAL2
24 17 XTAL1
Crystal Oscillator Pins. XTAL1 and XTAL2 provide support for parallel-resonant,
AT-cut crystals. XTAL1 acts also as an input if there is an external clock source in
place of a crystal. XTAL2 is the output of the crystal amplifier.
DS87C530/
DS83C530
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