MPC8260 UPM Timing Diagram, Rev. 2

2

Freescale Semiconductor

UPM Programming

1

UPM Programming

The basic steps to program the UPMs are as follows:

1. Set up BRx and ORx.

2. Configure MxMR[OP] = 01 for writing to a RAM array.

3. Write patterns to the RAM array by accessing the UPM with a single-byte transaction.

4. Program MPTPR and L/PSRT if refresh is required.

5. Configure MxMR[OP] = 00 for normal operation.

Example 1 shows the detailed assembly code for completing these general steps.

Example 1. Assembly Language

# Set up OR1

addis r2,r0,0xffff

ori

r2,r2,0x0820

addis r1,r0,0x0f01

ori

r1,r1,0x010c

stw

r2, 0x0000(r1)

# Set up BR1

addis r2,r0,0x0100

ori

r2,r2,0x1881

addis r1,r0,0x0f01

ori

r1,r1,0x0108

stw

r2, 0x0000(r1)

# MAMR OP = 01 for write RAM code starting at address 00 (READ Routine)

addis r2,r0,0x1000

ori

r2,r2,0x8000

addis r1,r0,0x0f01

ori

r1,r1,0x0170

stw

r2, 0x0000(r1)

# MDR

addis r2,r0,0x08ea

ori

r2,r2,0xa800

addis r1,r0,0x0f01