89S8252. IC89S8252 Datasheet

IC89S8252 Datasheet PDF


Part Number

IC89S8252

Description

89S8252

Manufacture

ATMEL Corporation

Total Page 30 Pages
PDF Download
Download IC89S8252 Datasheet PDF


IC89S8252 Datasheet
Features
Compatible with MCS-51™ Products
8K Bytes of In-System Reprogrammable Downloadable Flash Memory
– SPI Serial Interface for Program Downloading
– Endurance: 1,000 Write/Erase Cycles
2K Bytes EEPROM
– Endurance: 100,000 Write/Erase Cycles
4.0V to 6V Operating Range
Fully Static Operation: 0 Hz to 24 MHz
Three-Level Program Memory Lock
256 x 8-bit Internal RAM
32 Programmable I/O Lines
Three 16-bit Timer/Counters
Nine Interrupt Sources
www.DataShPereot4gUr.acmommable UART Serial Channel
SPI Serial Interface
Low Power Idle and Power Down Modes
Interrupt Recovery From Power Down
Programmable Watchdog Timer
Dual Data Pointer
Power Off Flag
Description
The AT89S8252 is a low-power, high-performance CMOS 8-bit microcomputer with
8K bytes of Downloadable Flash programmable and erasable read only memory and
2K bytes of EEPROM. The device is manufactured using Atmel’s high density nonvol-
atile memory technology and is compatible with the industry standard 80C51 instruc-
tion set and pinout. The on-chip Downloadable Flash allows the program memory to
be reprogrammed in-system through an SPI serial interface or by a conventional non-
volatile memory programmer. By combining a versatile 8-bit CPU with Downloadable
Flash on a monolithic chip, the Atmel AT89S8252 is a powerful microcomputer which
provides a highly flexible and cost effective solution to many embedded control appli-
cations.
The AT89S8252 provides the following standard features: 8K bytes of Downloadable
Flash, 2K bytes of EEPROM, 256 bytes of RAM, 32 I/O lines, programmable watch-
dog timer, two Data Pointers, three 16-bit timer/counters, a six-vector two-level inter-
rupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In
addition, the AT89S8252 is designed with static logic for operation down to zero fre-
quency and supports two software selectable power saving modes. The Idle Mode
stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt sys-
tem to continue functioning. The Power Down Mode saves the RAM contents but
freezes the oscillator, disabling all other chip functions until the next interrupt or hard-
ware reset.
The Downloadable Flash can be changed a single byte at a time and is accessible
through the SPI serial interface. Holding RESET active forces the SPI bus into a serial
programming interface and allows the program memory to be written to or read from
unless Lock Bit 2 has been activated.
8-Bit
Microcontroller
with 8K Bytes
Flash
AT89S8252
0401D-A–12/97
4-105

IC89S8252 Datasheet
Pin Configurations
PDIP
www.DataSheet4U.com
(T2) P1.0
(T2 EX) P1.1
P1.2
P1.3
(SS) P1.4
(MOSI) P1.5
(MISO) P1.6
(SCK) P1.7
RST
(RXD) P3.0
(TXD) P3.1
(INT0) P3.2
(INT1) P3.3
(T0) P3.4
(T1) P3.5
(WR) P3.6
(RD) P3.7
XTAL2
XTAL1
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40 VCC
39 P0.0 (AD0)
38 P0.1 (AD1)
37 P0.2 (AD2)
36 P0.3 (AD3)
35 P0.4 (AD4)
34 P0.5 (AD5)
33 P0.6 (AD6)
32 P0.7 (AD7)
31 EA/VPP
30 ALE/PROG
29 PSEN
28 P2.7 (A15)
27 P2.6 (A14)
26 P2.5 (A13)
25 P2.4 (A12)
24 P2.3 (A11)
23 P2.2 (A10)
22 P2.1 (A9)
21 P2.0 (A8)
PQFP/TQFP
PLCC
(MOSI) P1.5
(MISO) P1.6
(SCK) P1.7
RST
(RXD) P3.0
NC
(TXD) P3.1
(INT0) P3.2
(INT1) P3.3
(T0) P3.4
(T1) P3.5
7
8
9
10
11
12
13
14
15
16
17
39 P0.4 (AD4)
38 P0.5 (AD5)
37 P0.6 (AD6)
36 P0.7 (AD7)
35 EA/VPP
34 NC
33 ALE/PROG
32 PSEN
31 P2.7 (A15)
30 P2.6 (A14)
29 P2.5 (A13)
(MOSI) P1.5
(MISO) P1.6
(SCK) P1.7
RST
(RXD) P3.0
NC
(TXD) P3.1
(INT0) P3.2
(INT1) P3.3
(T0) P3.4
(T1) P3.5
1
2
3
4
5
6
7
8
9
10
11
33 P0.4 (AD4)
32 P0.5 (AD5)
31 P0.6 (AD6)
30 P0.7 (AD7)
29 EA/VPP
28 NC
27 ALE/PROG
26 PSEN
25 P2.7 (A15)
24 P2.6 (A14)
23 P2.5 (A13)
Pin Description
VCC
Supply voltage.
GND
Ground.
Port 0
Port 0 is an 8-bit open drain bidirectional I/O port. As an
output port, each pin can sink eight TTL inputs. When 1s
are written to port 0 pins, the pins can be used as high-
impedance inputs.
Port 0 can also be configured to be the multiplexed low-
order address/data bus during accesses to external pro-
gram and data memory. In this mode, P0 has internal pul-
lups.
Port 0 also receives the code bytes during Flash program-
ming and outputs the code bytes during program verifica-
tion. External pullups are required during program verifica-
tion.
Port 1
Port 1 is an 8-bit bidirectional I/O port with internal pullups.
The Port 1 output buffers can sink/source four TTL inputs.
When 1s are written to Port 1 pins, they are pulled high by
the internal pullups and can be used as inputs. As inputs,
Port 1 pins that are externally being pulled low will source
current (IIL) because of the internal pullups.
Some Port 1 pins provide additional functions. P1.0 and
P1.1 can be configured to be the timer/counter 2 external
count input (P1.0/T2) and the timer/counter 2 trigger input
(P1.1/T2EX), respectively.
4-106 AT89S8252


Features Datasheet pdf Features • Compatible with MCS-51™ P roducts • 8K Bytes of In-System Repro grammable Downloadable Flash Memory – SPI Serial Interface for Program Downl oading – Endurance: 1,000 Write/Erase Cycles • 2K Bytes EEPROM – Enduran ce: 100,000 Write/Erase Cycles • 4.0V to 6V Operating Range • Fully Static Operation: 0 Hz to 24 MHz • Three-Le vel Program Memory Lock • 256 x 8-bit Internal RAM • 32 Programmable I/O L ines • Three 16-bit Timer/Counters Nine Interrupt Sources www.DataSheet4 U.com • Programmable UART Serial Chan nel • SPI Serial Interface • Low Po wer Idle and Power Down Modes • Inter rupt Recovery From Power Down • Progr ammable Watchdog Timer • Dual Data Po inter • Power Off Flag 8-Bit Microco ntroller with 8K Bytes Flash AT89S8252 Description The AT89S8252 is a low-pow er, high-performance CMOS 8-bit microco mputer with 8K bytes of Downloadable Fl ash programmable and erasable read only memory and 2K bytes of EEPROM. The device is manufactured using Atmel’s high density nonvolatile memory .
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