ST72E121J4D0 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72E121J4D0

8-BIT MCU WITH 8 TO 16K OTP/EPROM, 384 TO 512 BYTES RAM, WDG, SCI, SPI AND 2 TIMERS

STMicroelectronics 

ST72E121 ST72T121

1.4 MEMORY MAP

Figure 5. Program Memory Map

0000h

007Fh

0080h

01FFh

027Fh

0200h / 0280h

HW Registers

(see Table 3)

384 Bytes RAM

512 Bytes RAM

Reserved

BFFFh

C000h

E000h

FFDFh

8K Bytes

Program

Memory

16K Bytes

Program

Memory

FFE 0h

Interrupt & Reset Vectors

FFFF h

(see Table 2)

0080h

00FFh

Short Addressing

RAM (zero page)

0100h 256 Bytes Stack/

01FFh 16-bit Addressing RAM

0080h

00FFh

Short Addressing

RAM (zero page)

0100h

256 Bytes Stack/

16-bit Addressing RAM

01FFh

0200h

027Fh

16-bit Addressing

RAM

Table 2. Interrupt Vector Map

Vector Address

FF E0-FFE1h

FF E2-FFE3h

FF E4-FFE5h

FF E6-FFE7h

FF E8-FFE9h

FF EA-FF EBh

FF EC-FFE Dh

FF EE-FFE Fh

FF F0-FF F1h

FF F2-FF F3h

FF F4-FF F5h

FF F6-FF F7h

FF F8-FF F9h

FFFA-FF FBh

FF FC-FF FDh

FF FE-FF FFh

Description

Not Used

Not Used

Not Used

SCI Interrupt Vector

TIMER B Interrupt Vector

TIMER A Interrupt Vector

SPI interrupt vector

Not Used

External Interrupt Vector EI3 (PB4)

External Interrupt Vector EI2 (PB0:PB3)

External Interrupt Vector EI1 (PF0:PF2)

External Interrupt Vector EI0 (PA3)

Not Used

Not Used

TRAP (software) Interrupt Vector

RESET Vector

Remarks

Internal Interrupt

Internal Interrupt

Internal Interrupt

Internal Interrupt

Internal Interrupt

External Interrupt

External Interrupt

External Interrupt

External Interrupt

CPU Interrupt

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