MC9S08DZ96F2CLL datasheet(64/458 Pages) FREESCALE

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Chapter 4 Memory

MC9S08DZ128 Series Data Sheet, Rev. 1

Freescale Semiconductor

4.4.3.3

Linear Word Post Increment Register (LWP)

This register is one of three data registers that the user can use to access any FLASH memory location in

the extended address map. When LWP is accessed the contents of LAP2:LAP0 make up the extended

address of the FLASH memory location to be addressed. When accessing data using LWP, the contents of

LAP2:LAP0 will increment after the read or write is complete.

Accessing LWP does the same thing as accessing LBP. The MMU register ordering of LWP followed by

LBP, allow the user to access data by words using the LDHX or STHX instructions of the LWP register.

4.4.3.4

Linear Byte Post Increment Register (LBP)

This register is one of three data registers that the user can use to access any FLASH memory location in

the extended address map. When LBP is accessed the contents of LAP2:LAP0 make up the extended

76543210

0000000

LA16

LA15

LA14

LA13

LA12

LA11

LA10

LA9

LA8

LA7

LA6

LA5

LA4

LA3

LA2

LA1

LA0

Reset:

Figure 4-6. Linear Address Pointer Registers 2:0 (LAP2:LAP0)

Table 4-7. Linear Address Pointer Registers 2:0 Field Descriptions

Field

Description

16:0

LA16:LA0

The values in LAP2:LAP0 are used to create a 17-bit linear address pointer. The value in these registers are used

as the extended address when accessing any of the data registers LB, LBP and LWP.

76543210

Reset:

Figure 4-7. Linear Word Post Increment Register (LWP)

Table 4-8. Linear Word Post Increment Register Field Descriptions

Field

Description

7:0

D7:D0

Reads of this register will ﬁrst return the data value pointed to by the linear address pointer, LAP2:LAP0 and then

will increment LAP2:LAP0. Writes to this register will ﬁrst write the data value to the memory location speciﬁed

by the linear address pointer and then will increment LAP2:LAP0. Writes to this register are most commonly used

when writing to the FLASH block(s) during programming.

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