KITMMA9550LEVM【PDF 65/410 页】KIT EVALUATION FOR MMA955XL

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Flash Memory Controller

6.6

Flash memory map/register definition

Flash control registers are not available directly from User mode. Nevertheless, the FOPT register will be

altered during POR and reset with the content of the upper two bytes of the main flash array. Flash

functions can only be accessed via the ROM routines described in Chapter 7, “ROM” .

Table 6-3. Flash memory map

Address offset

0x0000

Register

Flash Options Register (FOPT)

Access

RW

Reset

0x00FE

Details

6.6.1

Flash Options register

FOPT[7:0] is loaded from the last byte of the main array (NVOPT) during the reset sequence. Therefore

all modifications to FOPT[7:0] are lost at the next reset. Permanent changes to FOPT[7:0] can only be done

by modifying the flash data stored at NVOPT.

To change the value in this register, erase and reprogram the NVOPT location in flash memory as usual

and then issue a new MCU reset.

FOPT can only be read or modified when the CPU is in Supervisor mode.

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

Read

Reserved

BF

Rsv’d

0

CHECKB

1

1

PW

1

SSW

SSC

Write

0

0

0

Reset

0

0

0

0

0

0

0

0

1

1

1

1

1

1

1

0

= Unimplemented or Reserved

Figure 6-2. Flash Options register (FOPT)

Table 6-4. Flash Options register (FOPT) field descriptions

Bit(s)

15:14

13

12

11

Field

—

BF

—

—

Description

Reserved

Always write as “00.”

Boot from Flash

This is a simple R/W bit in the flash controller. T his bit is initialized to the inverse of Bit 5 of flash location

0x3FFE by the boot ROM on power-up. It is read by the ROM code in a later step of the reset process.

The code value affects where control is ultimately transferred.

0 Do not boot from flash.

1 Boot from flash on next reset.

Reserved

Always write as “0.”

Reserved

MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0

66

Freescale Semiconductor, Inc.

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