mc9s12hz256v2 Freescale Semiconductor, Inc, mc9s12hz256v2 Datasheet - Page 109

• Manufacturer Part Number: mc9s12hz256v2
• Description: Hcs12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Freescale Semiconductor
TRY TO DECREASE Tbus
Figure 3-17. PRDIV8 and EDIV Bits Determination Procedure
EDIV[5:0] = PRDCLK[MHz]*(5+Tbus[ s])-1
YES
PROGRAM/ERASE IMPOSSIBLE
EECLK = (PRDCLK)/(1+EDIV[5:0])
1/EECLK [MHz] + Tbus[ms] 5
PRDCLK = oscillator clock/8
PRDCLK[MHz]*(5+Tbus[ s])
MC9S12HZ256 Data Sheet, Rev. 2.05
EECLK > 0.15 MHz
PRDIV8 = 0 (reset)
EDIV[5:0]
OSCILLATOR
Tbus
> 12.8 MHz?
PRDIV8 = 1
an integer?
START
CLOCK
AND
?
1 s?
yes
yes
YES
NO
NO
4?
NO
NO
YES
PRDCLK = oscillator clock
NO
EDIV[5:0] = INT(PRDCLK[MHz]*(5+Tbus[ s]))
PROGRAM/ERASE IMPOSSIBLE
END
Chapter 3 2 Kbyte EEPROM Module (EETS2KV1)
109