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ST72262G2数据手册封面

ST72262G2 Datasheet

  • ST72262G2

  • 8-BIT MCU WITH FLASH OR ROM MEMORY, ADC, TWO 16-BIT TIMERS, ...

  • 2095.35KB

  • STMicroelectronics   STMicroelectronics

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ST72260G, ST72262G, ST72264G
I/O PORTS
(Cont鈥檇)
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.
9.3 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 29.
Other transitions
are potentially risky and should be avoided, since
they may present unwanted side-effects such as
spurious interrupt generation.
Figure 29. Interrupt I/O Port State Transitions
01
INPUT
floating/pull-up
interrupt
9.4 UNUSED I/O PINS
Unused I/O pins must be connected to fixed volt-
age levels. Refer to
Section 13.8.
9.5 LOW POWER MODES
Mode
WAIT
HALT
Description
No effect on I/O ports. External interrupts
cause the device to exit from WAIT mode.
No effect on I/O ports. External interrupts
cause the device to exit from HALT mode.
9.6 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).
Interrupt Event
External interrupt on
selected external
event
Enable
Event
Control
Flag
Bit
-
DDRx
ORx
Exit
from
Wait
Yes
Exit
from
Halt
Yes
00
INPUT
floating
(reset state)
10
OUTPUT
open-drain
11
OUTPUT
push-pull
XX
= DDR, OR
41/171

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