CP82C52 Intersil, CP82C52 Datasheet - Page 10

• Manufacturer Part Number: CP82C52
• Manufacturer: Intersil

Specifications of CP82C52

• Transmitter And Receiver Fifo Counter: No
• Operating Supply Voltage (typ): 5V
• Package Type: PDIP
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• Mounting: Through Hole
• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Supply Current: 4mA
• Number Of Channels: 1
• Lead Free Status / RoHS Status: Not Compliant

NOTE: C1 = C2 = 20pF For CL = 20pF
82C52 - 80C86 Interfacing
The following example (Figure 11) shows the interface for an
82C52 in an 80C86 system.
Use of the Intersil CMOS Interrupt Controller (82C59A) is
optional and necessary only if an interrupt driven system is
desired.
C1 = C2 = 47pF For CL = 32pF
GND
15MHz
C1 (NOTE)
C2 (NOTE)
FIGURE 10.
10
82C84A OR
X1
X2
82C85
PCLK
OSC
CLK
IX
OX
82C52
CLK
80C86
80C88
AD0, AD7
OR
2.5MHz
15MHz
5MHz
FIGURE 11. 80C86/82C52 INTERFACE
INTA
INT
(MAX MODE)
82C52
82C52
INT
INTA
82C59A
ADDRESS BUS
82C88
CHIP SELECT
IRX
By using the Intersil CMOS 82C84A clock generator, the
system can be built with a single crystal providing both the
processor clock and the clock for the 82C52. The 82C52 has
special divider circuitry which is designed to supply industry
standard baud rates with a 2.4576MHz input frequency.
Using a 15MHz crystal as shown, results in less than a 2%
frequency error which is adequate for many applications. For
more precise baud rate requirements, a 14.7456MHz crystal
will drive the 80C86 at 4.9MHz and provide the 82C52 with
the standard baud rate input frequency of 2.4576MHz. If
baud rates above 156Kbaud are desired, the OSC output
can be used instead of the PCLK (÷6) output for
asynchronous baud rates up to 1Mbaud.
IOWR
IORD
3
2
CSO
D0-D7
A0, A1
RD
WR
INTR, DR, TBRE
82C52
IX
SDO
SDI
SERIAL
DATA
April 26, 2006
FN2950.3