MC9S12XDP512CFU
Model | MC9S12XDP512CFU |
Description | 16-BIT, FLASH, 40MHz, MICROCONTROLLER, PQFP80 |
PDF file | Total 1348 pages (File size: 8M) |
Chip Manufacturer | PHILIPS |
Chapter 28 256 Kbyte Flash Module (S12XFTX256K2V1)
START
Tbus < 1µs?
yes
PRDIV8=0 (reset)
no
ALL COMMANDS IMPOSSIBLE
oscillator_clock
12.8MHz?
yes
no
PRDIV8=1
PRDCLK=oscillator_clock/8
PRDCLK=oscillator_clock
PRDCLK[MHz]*(5+Tbus[µs])
an integer?
yes
no
FDIV[5:0]=INT(PRDCLK[MHz]*(5+Tbus[µs]))
FDIV[5:0]=PRDCLK[MHz]*(5+Tbus[µs])-1
TRY TO DECREASE Tbus
FCLK=(PRDCLK)/(1+FDIV[5:0])
1/FCLK[MHz] + Tbus[µs] > 5
AND
FCLK > 0.15MHz
?
no
yes
END
yes
FDIV[5:0] > 4?
no
ALL COMMANDS IMPOSSIBLE
Figure 28-24. Determination Procedure for PRDIV8 and FDIV Bits
MC9S12XDP512 Data Sheet, Rev. 2.21
1168
Freescale Semiconductor