HC05 datasheet(182/232 Pages) MOTOROLA

182 / 232 page

MOTOROLA

A-10

MC68HC05X16

Rev. 1

MC68HC05X32

A.3.4

Control timing

(1) For bus frequencies less than 2 MHz, the internal RC oscillator should be used when

programming the EEPROM.

(2) Since a 2-bit prescaler in the timer must count four external cycles (tcyc), this is the limiting

factor in determining the timer resolution.

(3) The minimum period tTLTL should not be less than the number of cycle times it takes to execute

the capture interrupt service routine plus 24 tcyc.

(4) The minimum period tILIL should not be less than the number of cycle times it takes to execute

the interrupt service routine plus 21 tcyc.

(5) At a temperature of 85

°C.

(6) Refer to Reliability Monitor Report (currrent quarterly issue) for current failure rate information.

Table A-5 Control timing

(VDD = 5.0 Vdc ± 10%, VSS = 0 Vdc, TA = –40°C to +125°C)

Characteristic

Symbol

Min

Max

Unit

Frequency of operation

Oscillator frequency

MCAN module clock frequency

MCU bus frequency

fOSC

fCAN

fMCU

2.2

MHz

Cycle time (see Figure 10-1)tCYC

455

—

Crystal oscillator start-up time (see Figure 10-1)tOXOV

—

100

Stop recovery start-up time (crystal oscillator)

tILCH

100

A/D converter stabilization time

tADON

500

µs

External RESET input pulse width

tRL

1.5

—

tCYC

Power-on RESET output pulse width (mask option)

4064 cycle

16 cycle

tPORL

4064

—

tCYC

Watchdog RESET output pulse width

tDOGL

1.5

—

tCYC

Watchdog time-out

tDOG

6144

7168

tCYC

EEPROM byte erase time

tERA

EEPROM byte program time(1)

tPROG

Timer (see Figure A-3)

Resolution(2)

Input capture pulse width

Input capture pulse period

tRESL

tTH, tTL

tTLTL

125

—(3)

—

tCYC

Interrupt pulse width (edge-triggered)

tILIH

125

—

Interrupt pulse period

tILIL

—(4)

—tCYC

OSC1 pulse width

tOH, tOL

—

Write/erase endurance(5)(6)

—

10000

cycles

Data retention(5)(6)

—

years

180

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