Features: ` User Program Memory (ROM/OTP/EPROM):4 to 8K bytes
` Data RAM: 256 bytes, including 64 bytes of stack
` Master Reset and Power-On Reset
` Run, Wait, Slow and Halt modes
` 22 multifunctional bidirectional I/O lines:
22 programmable interrupt inputs
8 high sink outputs
6 Analog alternate inputs
16 Alternate Functions
EMI filtering
` Programmable watchdog (WDG)
` Two 16-bit Timers, each featuring:
2 Input Captures
2 Output Compares
External Clock input (on Timer A only)
PWM and Pulse Generator modes
` Synchronous Serial Peripheral Interface (SPI)
` Full I2C multiple Master/Slave interface
` 8-bit Analog-to-Digital converter (6 channels)
` 8-bit Data Manipulation
` 63 Basic Instructions
` 17 main Addressing Modes
` 8 x 8 Unsigned Multiply Instruction
` True Bit Manipulation
` Complete Development Support on PC/DOS-WINDOWSTM Real-Time Emulator
` Full Software Package on DOS/WINDOWSTM (C-Compiler, Cross-Assembler, Debugger) Pinout
Specifications
| Symbol |
Parameter |
Value |
Unit |
| VDD |
Supply Voltage |
-0.3 to 6.0 |
V |
| VI |
Input Voltage |
VSS - 0.3 to VDD + 0.3 |
V |
| VAI |
Analog Input Voltage (A/D Converter) |
VSS - 0.3 to VDD + 0.3
|
V |
| IO |
Current Drain per Pin Excluding VDD, VSS |
VSS - 0.3 to VDD + 0.3 |
V |
| IVDD |
Total Current into VDD (source) |
80 |
mA |
| IVSS |
Total Current out of VSS (sink) |
80 |
mA |
| Tj |
Junction Temperature |
150 |
|
| TSTG |
Storage Temperature |
-60 to 150 |
|
Note: Stresses above those listed as "absolute maximum ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these conditions is not implied. Exposure to maximum
rating conditions for extended periods may affect device reliability.
DescriptionThe ST72251 HCMOS Microcontroller Unit is a member of the ST7 family of Microcontrollers. The device is based on an industry-standard 8-bit core and features an enhanced instruction set. The de-vice normally operates at a 16MHz oscillator fre-quency. Under software control, the ST72251 may be placed in either WAIT, SLOW or HALT modes,thus reducing power consumption. The enhanced instruction set and addressing modes afford real programming potential. In addition to standard 8-bit data management, the ST72251 features true bit manipulation, 8x8 unsigned multiplication and indirect addressing modes on the whole memory.
The device includes an on-chip oscillator, CPU,program memory (ROM/OTP/EPROM versions),RAM, 22 I/O lines and the following on-chip pe-ripherals: Analog-to-Digital converter (ADC) with 6 multiplexed analog inputs, industry standard syn-chronous SPI serial interface, I2C multiple Master/Slave interface, digital Watchdog, two independ-ent 16-bit Timers, one featuring an External Clock Input, and both featuring Pulse Generator capabil-ities, 2 Input Captures and 2 Output Compares.
ST72251 Data Sheet
