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4 / 94 page 4/94 ST72371/ST72372 1 GENERAL DESCRIPTION 1.1 INTRODUCTION The ST72371/ST72372 HCMOS Microcontroller Units are members of the ST7 family. These devic- es are based on an industry standard 8-bit core and feature an enhanced instruction set. The proc- essor runs with an external clock up to 24 MHz with a 5.5V supply. Under software control the ST72371/ST72372 can be placed in WAIT, SLOW or HALT modes thus reducing power consump- tion. The enhanced instruction set and addressing modes afford real programming potential. In addition to standard 8-bit data management the ST7 features true bit manipulation, 8x8 unsigned multiplication and indirect addressing modes on the whole memory. The devices include an on-chip oscillator, CPU, 16K bytes program memory, 512 bytes RAM, 23 to 32 I/O lines, a Timer with 2 Input Captures and 2 Output Compares (with 1 output pin), a 4 to 8 channel A/D Converter, an I 2C multi Master, an SCI (1) Serial Communications Interface, a Watch- dog Reset, four 10-bit and one 12-bit D/A Convert- er channels with PWM output. Figure 1. ST72371/ST72372 Block Diagram (1)ST72371N only VSS OSCIN OSCOUT RESET ADC PORT C I2C PORT D SCI (1) PWM (DAC) Internal CLOCK VDD (16K Bytes) (512 Bytes) PROGRAM RAM PORT B PORT A VR02120E PA0-PA7 PB0-PB7 POWER SUPPLY 8-BIT CORE ALU CONTROL DA0-DA4 WATCHDOG TIMER OSC Mode Selection :3 ICAP2 ICAP1 (8 bits for ST72371N) (6 bits for ST72372J) (8 bits for ST72371N) (4 bits for ST72372J) MEMORY PC0-PC7 PD0-PD7 (8 bits for ST72371N) (6 bits for ST72372J) (8 bits for ST72371N) (7 bits for ST72372J) 4 |
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