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ATMEL Corporation |
Features
• 80C52 Compatible
– 8051 pin and instruction compatible
– Four 8-bit I/O ports + 2 I/O I2C Interface pins
– Three 16-bit timer/counters
– 256 bytes scratch pad RAM
– 10 Interrupt sources with 4 priority levels
– Dual Data Pointer
• Variable length MOVX for slow RAM/peripherals
• ISP (In System Programming) using standard VCC power supply.
• Boot ROM contains low level FLASH programming routines and a default serial loader
• High-Speed Architecture
– 40 MHz in standard mode
– 20 MHz in X2 mode (6 clocks/machine cycle)
• 32-Kbytes on-chip FLASH program / data Memory
– Byte and page (128 bytes) erase and write
– 10k write cycles
– On-chip 1024 bytes expanded RAM (XRAM)
– Software selectable size (0, 256, 512, 768, 1024 bytes)
– 256 bytes selected at reset for T87C51RB2/RC2 compatibility
• Keyboard interrupt interface on port P1
• 400-Kbits/s Multimaster I2C Interface
• SPI Interface (Master / Slave Mode)
• Sub clock 32kHz crystal oscillator
• 8-bit clock prescaler
• Improved X2 mode with independant selection for CPU and each peripheral
• Programmable Counter Array 5 Channels with:
– High Speed Output,
– Compare / Capture,
– Pulse Width Modulator,
– Watchdog Timer Capabilities
• Asynchronous port reset
• Full duplex Enhanced UART
• Dedicated Baud Rate Generator for UART
• Low EMI (inhibit ALE)
• Hardware Watchdog Timer (One-time enabled with Reset-Out)
• Power control modes:
– Idle Mode.
– Power-down mode.
– Power-Off Flag.
• Power supply: 4.5V to 5.5V or 2.7V to 3.6V
• Temperature ranges: Commercial (0 to +70°C) and industrial (-40°C to +85°C).
• Packages: PLC44, VQFP44
8-bit
Microcontroller
with Flash and
I2C Interface
T89C51IC2
Summary
Description
T89C51IC2 is a high performance FLASH version of the 80C51 8-bit microcontrollers.
It contains a 32-Kbytes Flash memory block for program and data.
The 32-Kbytes FLASH memory can be programmed either in parallel mode or in serial
mode with the ISP capability or with software. The programming voltage is internally
generated from the standard VCC pin.
The T89C51IC2 retains all features of the 80C52 with 256 bytes of internal RAM, a 7-
source 4-level interrupt controller and three timer/counters.
Rev. C – 3-Dec-01
1
Block Diagram
In addition, the T89C51IC2 has a 32kHz Subsidiary clock Oscillator, a Programmable
Counter Array, an XRAM of 1024 byte, a Hardware Watchdog Timer, a Keyboard Inter-
face, a I2C Interface, a SPI Interface, a more versatile serial channel that facilitates
multiprocessor communication (EUART) and a speed improvement mechanism (X2
mode).
The fully static design of the T89C51IC2 allows to reduce system power consumption by
bringing the clock frequency down to any value, even DC, without loss of data.
The T89C51IC2 has 2 software-selectable modes of reduced activity and 8 bit clock
prescaler for further reduction in power consumption. In the Idle mode the CPU is frozen
while the peripherals and the interrupt system are still operating. In the power-down
mode the RAM is saved and all other functions are inoperative.
The added features of the T89C51IC2 make it more powerful for applications that need
pulse width modulation, high speed I/O and counting capabilities such as alarms, motor
control, corded phones, smart card readers.
Table 1. Memory Size
PLCC44
VQFP44 1.4
T89C51IC2
Flash (bytes)
32k
XRAM (bytes)
1024
TOTAL RAM
(bytes)
1280
I/O
34
XTAL1
XTAL2
ALE/ PROG
PSEN
EA
RD ( 2)
WR ( 2)
(2) (2)
(1) ( 1) (1) (1)
CPU
EUART
+
BRG
RAM
256x8
F las h
32K x8 or
16K x8
XRAM
1Kx 8
Boot
RO M
2Kx8
C5 1
CORE
IB-bus
PCA Timer2
I2C
Timer 0
Timer 1
INT
Ctrl
(2) (2) (2) ( 2)
Parallel I/O Ports & Ext. Bus Watch Key
Dog B oard
Port 0 Port 1 Port 2 Port 3Port I2
SPI
(1) (1) (1) ( 1)
(1): Alternate function of Port 1
(2): Alternate function of Port 3
2 T89C51IC2
Rev. C – 3-Dec-01
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