MC9S08QD4 Datasheet, PDF (47/202 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 4 Memory Map and Register Definition
7
6
5
4
3
2
1
0
R DIVLD
PRDIV8
DIV
W
Reset
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 4-5. Flash Clock Divider Register (FCDIV)
Table 4-6. FCDIV Register Field Descriptions
Field
7
DIVLD
6
PRDIV8
5:0
DIV
Description
Divisor Loaded Status Flag — When set, this read-only status flag indicates that the FCDIV register has been
written since reset. Reset clears this bit and the first write to this register causes this bit to become set regardless
of the data written.
0 FCDIV has not been written since reset; erase and program operations disabled for flash.
1 FCDIV has been written since reset; erase and program operations enabled for flash.
Prescale (Divide) Flash Clock by 8
0 Clock input to the flash clock divider is the bus rate clock.
1 Clock input to the flash clock divider is the bus rate clock divided by 8.
Divisor for Flash Clock Divider — The flash clock divider divides the bus rate clock (or the bus rate clock
divided by 8 if PRDIV8 = 1) by the value in the 6-bit DIV field plus one. The resulting frequency of the internal
flash clock must fall within the range of 200 kHz to 150 kHz for proper flash operations. Program/Erase timing
pulses are one cycle of this internal flash clock which corresponds to a range of 5 μs to 6.7 μs. The automated
programming logic uses an integer number of these pulses to complete an erase or program operation. See
Equation 4-1 and Equation 4-2.
if PRDIV8 = 0 – f_FCLK = f_Bus ÷ (DIV + 1)
if PRDIV8 = 1 – f_FCLK = f_Bus ÷ (8 × (DIV + 1))
Table 4-7 shows the appropriate values for PRDIV8 and DIV for selected bus frequencies.
Table 4-7. Flash Clock Divider Settings
f_Bus
8 MHz
4 MHz
2 MHz
1 MHz
200 kHz
150 kHz
PRDIV8
(Binary)
0
0
0
0
0
0
DIV
(Decimal)
39
19
9
4
0
0
f_FCLK
200 kHz
200 kHz
200 kHz
200 kHz
200 kHz
150 kHz
Program/Erase Timing Pulse
(5 μs Min, 6.7 μs Max)
5 μs
5 μs
5 μs
5 μs
5 μs
6.7 μs
Eqn. 4-1
Eqn. 4-2
MC9S08QD4 Series MCU Data Sheet, Rev. 3
Freescale Semiconductor
47