ST72334J4TC View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72334J4TC

8-bit MCU for automotive with single voltage Flash/ROM memory, ADC, 16-bit timers, SPI, SCI interfaces

STMicroelectronics 

ST72334xx-Auto, ST72314xx-Auto, ST72124Jx-Auto

12 MISCELLANEOUS REGISTERS

The miscellaneous registers allow control over

several different features such as the external in-

terrupts or the I/O alternate functions.

12.1 I/O PORT INTERRUPT SENSITIVITY

The external interrupt sensitivity is controlled by

the ISxx bits of the MISCR1 miscellaneous regis-

ter. This control allows to have two fully independ-

ent external interrupt source sensitivities.

Each external interrupt source can be generated

on four different events on the pin:

■ Falling edge

■ Rising edge

■ Falling and rising edge

■ Falling edge and low level

To guarantee correct functionality, the sensitivity

bits in the MISCR1 register must be modified only

when the I bit of the CC register is set to 1 (inter-

rupt masked). See I/O port register and Miscella-

neous register descriptions for more details on the

programming.

12.2 I/O PORT ALTERNATE FUNCTIONS

The MISCR registers manage four I/O port miscel-

laneous alternate functions:

■ Main clock signal (fCPU) output on PF0

■ A beep signal output on PF1 (with 3 selectable

audio frequencies)

■ SPI pin configuration:

– SS pin internal control to use the PC7 I/O port

function while the SPI is active.

These functions are described in detail in the Sec-

tion 12 "MISCELLANEOUS REGISTERS" on

page 47.

Figure 27. Ext. Interrupt Sensitivity

PB0

PB1

PB2

PB3

PB4

PB5

PB6

PB7

PA0

PA1

PA2

PA3

PF0

PF1

PF2

MISCR1

INTERRUPT

SOURCE

ei2

ei3

IS10 IS11

SENSITIVITY

CONTROL

MISCR1

INTERRUPT

SOURCE

ei0

ei1

IS20 IS21

SENSITIVITY

CONTROL

47/150

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