ST72121J4 查看數據表（PDF） - STMicroelectronics

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ST72121J4

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

FFE0h

Interrupt & Reset Vectors

FFFFh

(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

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

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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