PC912XDP512F0MPVR datasheet(1152/1348 Pages) FREESCALE

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Chapter 28 256 Kbyte Flash Module (S12XFTX256K2V1)

MC9S12XDP512 Data Sheet, Rev. 2.21

1154

Freescale Semiconductor

28.3.2.1

Flash Clock Divider Register (FCLKDIV)

The 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.

28.3.2.2

Flash Security Register (FSEC)

The FSEC register holds all bits associated with the security of the MCU and Flash module.

RESERVED1

0000000

RESERVED2

0000000

RESERVED3

0000000

RESERVED4

0000000

76543210

FDIVLD

PRDIV8

FDIV5

FDIV4

FDIV3

FDIV2

FDIV1

FDIV0

Reset

00000000

= Unimplemented or Reserved

Figure 28-4. Flash Clock Divider Register (FCLKDIV)

Table 28-2. FCLKDIV Field Descriptions

Field

Description

FDIVLD

Clock Divider Loaded.

0 Register has not been written.

1 Register has been written to since the last reset.

PRDIV8

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.

5:0

FDIV[5:0]

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 Section 28.4.1.1, “Writing the

FCLKDIV Register” for more information.

Name

Bit 7

654321

Bit 0

Figure 28-3. FTX256K2 Register Summary (continued)

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