MAS3587F datasheet(25/82 Pages) MICRONAS

25 / 82 page

ADVANCE INFORMATION

MAS 3587F

Micronas

3.3.1.1. Run and Freeze

The Run command causes the start of a program part at address a = (a3,a2,a1,a0). Since nibble a3 is also the com-

mand code (see Table 3–4), it is restricted to values between 0 and 3.

If the start address is 1000hex ≤ a < 3FFFhex and the respective RAM area has been configured as program RAM

(see Table 3–5 on page 32), the MAS 3587F continues execution with a custom program already downloaded to this

area.

Example 1: Start program execution at address 345hex:

Example 2: Start execution of a downloaded code at address 3000hex:

Freeze is a special run command with start address 0. It suspends all normal program execution. The operating sys-

tem will enter an idle loop so that all registers and memory cells can be watched. This state is useful for operations

like downloading code or contents of memory cells because the internal program cannot overwrite these values.

This freezing will be required if alternative software is downloaded into the internal RAM of the MAS 3587F.

Freeze has the following I2C protocol:

3.3.1.2. Read Register (Code Ahex)

Some registers (r = r1,r0 in the figure above) are direct control inputs for various hardware blocks, others control the

internal program flow. In contrast to memory cells, registers cannot be accessed as a block but must always be

addressed individually.

Example:

Read the content of the PIO data register (C8hex):

define register

and read

$68

a3,a2

a1,a0

$68

a,r1

r0,0

x,x

x,d4

d3,d2

d1,d0

2) get register value

1) send command

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