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ST7LITES2

8-BIT MICROCONTROLLER WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI

STMicroelectronics 

ST7LITE0x, ST7LITESx

13.5 CLOCK AND TIMING CHARACTERISTICS

Subject to general operating conditions for VDD, fOSC, and TA.

13.5.1 General Timings

Symbol

Parameter 1)

Conditions

tc(INST)

tv(IT)

Instruction cycle time

Interrupt reaction time 3)

tv(IT) = ∆tc(INST) + 10

fCPU=8MHz

fCPU=8MHz

Min

2

250

10

1.25

Typ 2)

3

375

Max

12

1500

22

2.75

Unit

tCPU

ns

tCPU

µs

13.5.2 External Clock Source

Symbol

VCLKINH

VCLKINL

tw(CLKINH)

tw(CLKINL)

tr(CLKIN)

tf(CLKIN)

IL

Parameter

CLKIN input pin high level voltage

CLKIN input pin low level voltage

CLKIN high or low time 4)

CLKIN rise or fall time 4)

CLKIN Input leakage current

Conditions

see Figure 60

VSS≤VIN≤VDD

Min

Typ

0.7xVDD

VSS

15

Max

VDD

0.3xVDD

Unit

V

ns

15

±1

µA

Notes:

1. Guaranteed by Design. Not tested in production.

2. Data based on typical application software.

3. Time measured between interrupt event and interrupt vector fetch. ∆tc(INST) is the number of tCPU cycles needed to fin-

ish the current instruction execution.

4. Data based on design simulation and/or technology characteristics, not tested in production.

Figure 60. Typical Application with an External Clock Source

VCLKINH

VCLKINL

90%

10%

tr(CLKIN)

tfCLKIN)

tw(CLKINH)

tw(CLKINL)

EXTERNAL

CLOCK SOURCE

CLKIN

fOSC

IL

ST72XXX

92/125

1

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