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ST7DALI Datasheet(PDF) 49 Page - STMicroelectronics

Part No. ST7DALI
Description  8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI, DALI
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST7DALI
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I/O PORTS (Cont’d)
Analog alternate function
Configure the I/O as floating input to use an ADC
input. The analog multiplexer (controlled by the
ADC registers) switches the analog voltage
present on the selected pin to the common analog
rail, connected to the ADC input.
Analog Recommendations
Do not change the voltage level or loading on any
I/O while conversion is in progress. Do not have
clocking pins located close to a selected analog
pin.
WARNING: The analog input voltage level must
be within the limits stated in the absolute maxi-
mum ratings.
10.3 I/O PORT IMPLEMENTATION
The hardware implementation on each I/O port de-
pends on the settings in the DDR and OR registers
and specific I/O port features such as ADC input or
open drain.
Switching these I/O ports from one state to anoth-
er should be done in a sequence that prevents un-
wanted side effects. Recommended safe transi-
tions are illustrated in Figure 31. Other transitions
are potentially risky and should be avoided, since
they may present unwanted side-effects such as
spurious interrupt generation.
Figure 31. Interrupt I/O Port State Transitions
10.4 UNUSED I/O PINS
Unused I/O pins must be connected to fixed volt-
age levels. Refer to Section 13.8.
10.5 LOW POWER MODES
10.6 INTERRUPTS
The external interrupt event generates an interrupt
if the corresponding configuration is selected with
DDR and OR registers and if the I bit in the CC
register is cleared (RIM instruction).
Mode
Description
WAIT
No effect on I/O ports. External interrupts
cause the device to exit from WAIT mode.
HALT
No effect on I/O ports. External interrupts
cause the device to exit from HALT mode.
Interrupt Event
Event
Flag
Enable
Control
Bit
Exit
from
Wait
Exit
from
Halt
External interrupt on
selected external
event
-
DDRx
ORx
Yes
Yes
01
floating/pull-up
interrupt
INPUT
00
floating
(reset state)
INPUT
10
open-drain
OUTPUT
11
push-pull
OUTPUT
XX
= DDR, OR
1




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