ST7LITE49K2 STMicroelectronics, ST7LITE49K2 Datasheet - Page 78

• Manufacturer Part Number: ST7LITE49K2
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST7LITE49K2

• 8 Kbytes Single Voltage Extended Flash (xflash) Program Memory With Read-out Protection In-circuit Programming And In-application Programming (icp And Iap) Endurance: 10K write/erase cycles guaranteed Data retention
• 256 Bytes Data Eeprom With Read-out Protection. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55 °C.
• Clock Sources: Internal trimmable 8 MHz RC oscillator, auto-wakeup internal low power - low frequency oscillator, crystal/ceramic resonator or external clock
• Five Power Saving Modes: Halt, Active-halt, Auto-wakeup from Halt, Wait and Slow

I/O ports
10.2.4
Caution:
10.3
10.4
10.5
78/245
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.
The analog input voltage level must be within the limits stated in the absolute maximum
ratings.
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 35. Interrupt I/O port state transitions
Unused I/O pins
Unused I/O pins must be connected to fixed voltage levels. Refer to
pin
Low power modes
Table 26.
s
characteristics.
Mode
Wait
Halt
Effect of low power modes on I/O ports
No effect on I/O ports. External interrupts cause the device to exit from Wait
No effect on I/O ports. External interrupts cause the device to exit from Halt
floating/pull-up
interrupt
INPUT
01
(reset state)
floating
INPUT
00
open-drain
OUTPUT
XX
Description
10
mode.
mode.
= DDR, OR
OUTPUT
push-pull
11
Section 13.9: I/O port
ST7LITE49K2
Figure
35.