ST7LITE20F2 datasheet(29/166 Pages) STMICROELECTRONICS

Part #	ST7LITE20F2

Description	8-bit microcontroller with single voltage Flash memory, data EEPROM, ADC, Timers, SPI

PDF	166 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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29 / 166 page

ST7LITE20F2 ST7LITE25F2 ST7LITE29F2

Central processing unit

Doc ID 8349 Rev 5

29/166

Central processing unit

6.1

Introduction

This CPU has a full 8-bit architecture and contains six internal registers allowing efficient

8-bit data manipulation.

6.2

Main features

●

63 basic instructions

●

Fast 8-bit by 8-bit multiply

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17 main addressing modes

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Two 8-bit index registers

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16-bit stack pointer

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Low power modes

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Maskable hardware interrupts

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Non-maskable software interrupt

6.3

CPU registers

The 6 CPU registers shown in Figure 10 are not present in the memory mapping and are

accessed by specific instructions.

Figure 10. CPU registers

Accumulator

X index register

Y index register

Stack pointer

Condition code register

Program counter

11H I

N Z

Reset value = reset vector @ FFFEh-FFFFh

PCH

PCL

Reset value = stack higher address

Reset value =

11X 1X X

Reset value = XXh

X = Undefined value

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