ST7DALIF2 STMicroelectronics, ST7DALIF2 Datasheet - Page 66

• Manufacturer Part Number: ST7DALIF2
• Description: 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI
• Manufacturer: STMicroelectronics

Specifications of ST7DALIF2

• 8 Kbytes Single Voltage Flash Program Memory With Read-out Protection, In-circuit Programming And In-application Programming (icp And Iap). 10k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55°C.
• 256 Bytes Data Eeprom With Read-out Protection. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55°C.
• Clock Sources: Internal 1% RC oscillator, crystal/ceramic resonator or external clock
• Five Power Saving Modes: Halt, Active-Halt, Wait and Slow, Auto Wake Up From Halt

I/O ports
12.3
12.4
12.5
12.6
66/171
I/O port implementation
The hardware implementation on each I/O port depends 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 another should be done in a sequence that
prevents unwanted side effects. Recommended safe transitions are illustrated in
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
Unused I/O pins
Unused I/O pins must be connected to fixed voltage levels. Refer to
Low power modes
Table 27.
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).
Table 28.
External interrupt on selected
external event
Mode
Wait
Halt
Interrupt event
Effect of low power modes on I/O ports
I/O port interrupt control/wake-up capability
floating/pull-up
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.
interrupt
INPUT
01
(reset state)
floating
INPUT
00
Event
flag
-
open-drain
OUTPUT
10
Description
XX
control
Enable
DDRx
ORx
= DDR, OR
bit
OUTPUT
push-pull
11
Section
from
Wait
Exit
Yes
20.
ST7DALIF2
Figure
from
Halt
Exit
Yes
31.