mc9s12hz256v2 Freescale Semiconductor, Inc, mc9s12hz256v2 Datasheet - Page 65

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

2.3.2.1
The unbanked FCLKDIV register is used to control timed events in program and erase algorithms.
All bits in the FCLKDIV register are readable, bits 6-0 are write once and bit 7 is not writable.
2.3.2.2
The unbanked FSEC register holds all bits associated with the security of the MCU and Flash module.
Freescale Semiconductor
FDIV[5:0]
FDIVLD
PRDIV8
RESERVED2
RESERVED3
RESERVED4
Reset
Field
Register
5-0
7
6
Name
W
R
FDIVLD
Clock Divider Loaded.
0 Register has not been written.
1 Register has been written to since the last reset.
Enable Prescalar by 8
0 The oscillator clock is directly fed into the clock divider
1 The oscillator clock is divided by 8 before feeding into the clock divider.
Clock Divider Bits — The combination of PRDIV8 and FDIV[5:0] must divide the oscillator clock down to a
frequency of 150 kHz–200 kHz. The maximum divide ratio is 512. Please refer to
FCLKDIV Register”
Flash Clock Divider Register (FCLKDIV)
Flash Security Register (FSEC)
7
0
W
W
W
R
R
R
= Unimplemented or Reserved
PRDIV8
Bit 7
Figure 2-3. FTS256K2 Register Summary (continued)
0
0
0
6
0
Figure 2-4. Flash Clock Divider Register (FCLKDIV)
for more information.
.
= Unimplemented or Reserved
Table 2-4. FCLKDIV Field Descriptions
6
0
0
0
FDIV5
MC9S12HZ256 Data Sheet, Rev. 2.05
5
0
5
0
0
0
FDIV4
4
0
Description
4
0
0
0
.
FDIV3
3
0
Chapter 2 256 Kbyte Flash Module (FTS256K2V1)
3
0
0
0
FDIV2
2
0
2
0
0
0
Section 2.4.1.1, “Writing the
FDIV1
1
0
1
0
0
0
Bit 0
FDIV0
0
0
0
0
0
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