ST7LITEU09 STMicroelectronics, ST7LITEU09 Datasheet - Page 45

• Manufacturer Part Number: ST7LITEU09
• Description: ST7ULTRALITE - 8-BIT MCU WITH 2K SINGLE VOLTAGE FLASH MEMORY, ADC, TIMERS
• Manufacturer: STMicroelectronics

Specifications of ST7LITEU09

• 2k Bytes Single Voltage Flash Program Memory With Read-out Protection, In-circuit And In-application Programming (icp And Iap). 10k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55°C
• 128 Bytes Data Eeprom. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55°C
• Clock Sources: internal trimmable 8MHz RC oscillator, internal low power, low frequency RC oscillator or external clock
• Five Power Saving Modes: Halt, Auto Wake Up from Halt, Active-Halt, Wait and Slow
• One 8-bit Lite Timer (lt) With Prescaler Including: watchdog, 1 realtime base and 1 input capture

ST7LITEU05 ST7LITEU09
8.3.1
Note:
Table 11.
8.3.2
ISx1
0
0
1
1
1
2
3
External interrupt control register 1 (EICR1)
Reset value: 0000 0000 (00h)
Bits 7:6 = Reserved, must be kept cleared.
Bits 5:4 = IS2[1:0] ei2 sensitivity bits
Bits 3:2 = IS1[1:0] ei1 sensitivity bits
Bits 1:0 = IS0[1:0] ei0 sensitivity bits
These 8 bits can be written only when the I bit in the CC register is set.
Changing the sensitivity of a particular external interrupt clears this pending interrupt. This
can be used to clear unwanted pending interrupts. Refer to “External interrupt function” on
page 61.
Whatever the sensitivity configuration, ei2 cannot exit the MCU from Halt, Active-Halt and
AWUFH modes when a falling edge occurs.
Interrupt sensitivity bits
External interrupt control register 2 (EICR2)
Reset Value: 0000 0000 (00h)
Bits 7:4 = Reserved
Bits 3:2 = IS4[1:0] ei4 sensitivity
These bits define the interrupt sensitivity for ei1 according to
Bits 1:0 = IS3[1:0] ei3 sensitivity
These bits define the interrupt sensitivity for ei0 according to
ISx0
0
1
0
1
These bits define the interrupt sensitivity for ei2 (Port C) according to
These bits define the interrupt sensitivity for ei1 (Port B) according to
These bits define the interrupt sensitivity for ei0 (Port A) according to
7
0
0
7
0
0
IS21
0
External interrupt sensitivity
Falling edge & low level
Rising and falling edge
Falling edge only
Rising edge only
IS20
0
Read/write
Read/write
IS11
IS41
IS10
IS40
Table
Table
11.
11.
IS01
IS31
Table
Table
Table
11.
11.
11.
Interrupts
IS00
IS30
0
0
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