ST72141K datasheet(10/132 Pages) STMICROELECTRONICS

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ST72141K

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1.4 REGISTER & MEMORY MAP

As shown in Figure 6, the MCU is capable of ad-

dressing 64K bytes of memories and I/O registers.

The available memory locations consist of 128

bytes of register locations, 256 bytes of RAM and

8Kbytes of user program memory. The RAM

space includes up to 64 bytes for the stack from

0140h to 017Fh.

The highest address bytes contain the user reset

and interrupt vectors.

Figure 6. Memory Map

Table 2. Interrupt Vector Map

0000h

Program Memory

(8K Bytes)

Interrupt & Reset Vectors

HW Registers

DFFFh

0080h

007Fh

(see Table 3)

E000h

FFDFh

FFE0h

FFFFh

(see Table 2)

0180h

Reserved

017Fh

Short Addressing

RAM

16-bit Addressing

0100h

013Fh

0080h

00FFh

256 Bytes RAM

RAM

Stack or

16-bit Addressing

0140h

017Fh

RAM

(64 Bytes)

“Zero page”

(64 Bytes)

(128 Bytes)

Vector Address

Description

Remarks

FFE0-FFE1h

FFE2-FFE3h

FFE4-FFE5h

FFE6-FFE7h

FFE8-FFE9h

FFEA-FFEBh

FFEC-FFEDh

FFEE-FFEFh

FFF0-FFF1h

FFF2-FFF3h

FFF4-FFF5h

FFF6-FFF7h

FFF8-FFF9h

FFFA-FFFBh

FFFC-FFFDh

FFFE-FFFFh

Not used

TIMER B interrupt vector

TIMER A interrupt vector

SPI interrupt vector

Motor control interrupt vector (events: E, O)

Motor control interrupt vector (events: C, D)

Motor control interrupt vector (events: R, Z)

External interrupt vector EI1: port B7..0

External interrupt vector EI0: port A7..0

Not used

TRAP (software) interrupt vector

RESET vector

Internal Interrupt

External Interrupt

CPU Interrupt

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