Benchmark ADC16 Datenblatt Seite 46

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ST72334J/N, ST72314J/N, ST72124J
46/153
13 MISCELLANEOUS REGISTERS
The miscellaneous registers allow control over
several different features such as the external in-
terrupts or the I/O alternate functions.
13.1 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.
13.2 I/O PORT ALTERNATE FUNCTIONS
The MISCR registers manage four I/O port miscel-
laneous alternate functions:
Main clock signal (f
CPU
) 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 13 "MISCELLANEOUS REGISTERS" on
page 46.
Figure 28. Ext. Interrupt Sensitivity
ei2
INTERRUPT
SOURCE
IS10 IS11
MISCR1
SENSITIVITY
CONTROL
PB1
PB2
PB0
PB3
PB5
PB6
PB4
PB7
ei3
ei0
INTERRUPT
SOURCE
IS20 IS21
MISCR1
SENSITIVITY
CONTROL
PA1
PA2
PA0
PA3
PF1
PF2
PF0
ei1
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