TMS370 datasheet(14/60 Pages) TI

14 / 60 page

TMS370Cx2x

8-BIT MICROCONTROLLER

SPNS018C – FEBRUARY 1993 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

interrupts (continued)

CPU

NMI

Logic

Enable

IE1

IE2

Level 1 INT

Level 2 INT

Priority

EXT INT 3

INT3 PRI

INT 3

STATUS REG

EXT INT1

INT1 PRI

INT1

SPI INT

SPI PRI

SPI

EXT INT 2

INT2 PRI

INT 2

TIMER 1

T1 PRI

Overflow

Compare1

Ext Edge

Compare2

Input Capture 1

Watchdog

SCI1 INT

BRKDT

RXRDY

TXRDY

TXPRI

RXPRI

Figure 4. Interrupt Control

Four of the system interrupts are generated by on-chip peripheral functions, and three external interrupts are

supported. Software configuration of the external interrupts is performed through the INT1, INT2, and INT3

control registers in peripheral file frame 1. Each external interrupt is individually software configurable for input

polarity (rising or falling) for ease of system interface. External interrupt INT1 is software configurable as either

a maskable or non-maskable interrupt. When INT1 is configured as non-maskable, it cannot be masked by the

individual- or global-enable mask bits. The INT1 NMI bit is protected during non-privileged operation and

therefore should be configured during the initialization sequence following reset. To maximize pin flexibility,

external interrupts INT2 and INT3 can be software configured as general-purpose input/output pins if the

interrupt function is not required (INT1 can be similarly configured as an input pin).

TMS370 Datasheet(PDF) 14 Page - Texas Instruments

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