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4 / 101 page 4/101 ST72E311 ST72T311 1 GENERAL DESCRIPTION 1.1 INTRODUCTION The ST72T311 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 ST72T311 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 ST72T311 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, 44 (ST72T311N) or 32 (ST72T311J) I/O lines, a Low Voltage Detector (LVD) and the following on-chip peripherals: Analog-to-Digital converter (ADC) with 8 (ST72T311N) or 6 (ST72T311J) multiplexed analog inputs, industry standard synchronous SPI and asynchronous SCI serial interfaces, digital 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. ST72T311 Block Diagram 8-BIT CORE ALU OSCIN OSCOUT RESET PORT B TIMER B PORT C SPI PORT E SCI PORT D 8-BIT ADC WATCHDOG PB0 -> PB7 PC0 -> PC7 PE0 -> PE7 PD0 -> PD7 OSC Internal CLOCK CONTROL RAM (384 - 512 Bytes) PORT F PF0 -> PF2,4,6,7 TIMER A PORT A PA0 -> PA7 VSSA VDDA (6 bits for ST72T311N) (6 bits) AND LVD (2 bits for ST72T311J) (8 bits for ST72T311N) (6 bits for ST72T311J) (8 bits for ST72T311N) (5 bits for ST72T311J) (8 bits) (8 bits for ST72T311N) (5 bits for ST72T311J) VSS VDD POWER SUPPLY PROGRAM (8 - 16K Bytes) MEMORY 4 |
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