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ST72E121 Datasheet(PDF) 4 Page - STMicroelectronics |
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ST72E121 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 92 page 4/92 ST72E121 ST72T121 1 GENERAL DESCRIPTION 1.1 INTRODUCTION The ST72T121 HCMOS Microcontroller Unit (MCU) is a member of the ST7 family. The device is based on an industry-standard 8-bit core and features an enhanced instruction set. The device is normally operated at a 16 MHz oscillator fre- quency. Under software control, the ST72T121 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 ST72T121 features true bit manipulation, 8x8 unsigned multiplication and indirect addressing modes on the whole mem- ory. The device includes a low consumption and fast start on-chip oscillator, CPU, program memo- ry (OTP/EPROM versions), RAM, 32 I/O lines, a Low Voltage Detector (LVD) and the following on- chip peripherals: industry standard synchronous SPI and asynchronous SCI serial interfaces, digit- al Watchdog, two independent 16-bit Timers, one featuring an External Clock Input, and both featur- ing Pulse Generator capabilities, 2 Input Captures and 2 Output Compares (only 1 Input Capture and 1 Output Compare on Timer A). Figure 1. ST72T121 Block Diagram 8-BIT CORE ALU OSCIN OSCOUT RESET PORT B TIMER B PORT C SPI PORT E SCI PORT D WATCH DOG PB0 -> PB4 PC0 -> PC7 PE0 -> PE1 PD0 -> PD5 OSC Internal CLOCK CONTROL RAM (384 - 512 Bytes) PORT F PF0 -> PF2,4,6,7 TIMER A PORT A PA3 -> PA7 (6 bits) AND LVD (6 bits) (8 bits) VSS VDD POWER SUPPLY PROGRAM (8 - 16K Bytes) MEMORY (2 bits) (5 bits) (5 bits) 4 |
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