ST10F280 datasheet(31/186 Pages) STMICROELECTRONICS

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ST10F280

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5.5.3 - Programming Examples

Most of the microcontroller programs are written in the C language where the data page pointers are

automatically set by the compiler. But because the C compiler may use the not allowed direct addressing

mode for Flash write addresses, it is necessary to program the organisational Flash accesses (command

sequences) with assembler in-line routines which use indirect addressing.

Example 1 Performing the command Read/Reset

We assume that in the initialization phase the lowest 32K Bytes of Flash memory (sector 0) have been

mapped to segment 1.

According to the usual way of ST10 data addressing with data page pointers, address bit A15 and A14 of

a 16-bit command write address select the data page pointer (DPP) which contains the upper 10-bit for

building the 24-bit physical data address. Address bit A13...A0 represent the address offset. As the bit

A14...A18 are "don’t care" when written a Flash command in the Command Interface (CI), we can choose

the most conveniant DPPx register for address handling.

The following examples are making usage of DPP0. We just have to make sure, that DPP0 points to

active Flash memory space.

To be independent of mapping of sector 0 we choose for all DPPs which are used for Flash address

handling, to point to segment 2.

For this reason we load DPP0 with value 08h (00 0000 l000b).

MOV

R5, #01554h

;load auxilary register R5 with command address

;(used in command cycle 1)

MOV

R6, #02AA8h

;load auxilary register R6 with command address

;(used in command cycle 2)

SCXT

DPPO, #08h

;push data page pointer 0 and load it to point to

;segment 2

MOV

R7, #0A8h

;load register R7 with 1st CI enable command

MOV

[R5], R7

;command cycle 1

MOV

R7, #054h

;load register R7 with 2cd CI enable command

MOV

[R6], R7

;command cycle 2

MOV

R7, #0F0h

;load register R7 with Read/Reset command

MOV

[R5], R7

;command cycle 3. Address is don’t care

POP

DPP0

;restore DPP0 value

In the example above the 16-bit registers R5 and R6 are used as auxilary registers for indirect

addressing.

Example 2 Performing a Program Word command

We assume that in the initialization phase the lowest 32K Bytes of Flash memory (sector 0) have been

mapped to segment 1.The data to be written is loaded in register R13, the address to be programmed is

loaded in register R11/R12 (segment number in R11, segment offset in R12).

MOV

R5, #01554h

;load auxilary register R5 with command address

;(used in command cycle 1)

MOV

R6, #02AA8h

;load auxilary register R6 with command address

;(used in command cycle 2)

SXCT

DPPO, #08h

;push data page pointer 0 and load it to point to

;segment 2

MOV

R7, #0A8h

;load register R7 with 1st CI enable command

MOV

[R5], R7

;command cycle 1

MOV

R7, #054h

;load register R7 with 2cd CI enable command

MOV

[R6], R7

;command cycle 2

MOV

R7, #0A0h

;load register R7 with Program Word command

MOV

[R5], R7

;command cycle 3

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