TMS320UC5402 datasheet(12/63 Pages) TI

12 / 63 page

TMS320UC5402

FIXED-POINT DIGITAL SIGNAL PROCESSOR

SPRS096A – APRIL 1999 – REVISED DECEMBER 1999

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

extended program memory

The ’UC5402 uses a paged extended memory scheme in program space to allow access of up to 1024K

program memory locations. In order to implement this scheme, the ’UC5402 includes several features that are

also present on the ’548/’549 devices:

D Twenty address lines, instead of sixteen

D An extra memory-mapped register, the XPC register, defines the page selection. This register is

memory-mapped into data space to address 001Eh. At a hardware reset, the XPC is initialized to 0.

D Six extra instructions for addressing extended program space. These six instructions affect the XPC.

–

FB[D] pmad (20 bits) – Far branch

–

FBACC[D] Accu[19:0] – Far branch to the location specified by the value in accumulator A or

accumulator B

–

FCALL[D] pmad (20 bits) – Far call

–

FCALA[D] Accu[19:0] – Far call to the location specified by the value in accumulator A or accumulator B

–

FRET[D] – Far return

–

FRETE[D] – Far return with interrupts enabled

D In addition to these new instructions, two ’54x instructions are extended to use 20 bits in the ’UC5402:

–

READA data_memory (using 20-bit accumulator address)

–

WRITA data_memory (using 20-bit accumulator address)

All other instructions, software interrupts, and hardware interrupts do not modify the XPC register and access

only memory within the current page.

Program memory in the ’UC5402 is organized into 16 pages that are each 64K in length, as shown in Figure 2.

0 0000

1 0000

1 3FFF

Page 1

Lower

16K

}

External

2 0000

2 3FFF

Page 2

Lower

16K

}

External

. . .

F 0000

F 3FFF

Page 15

Lower

16K

}

External

0 FFFF

Page 0

64K

Words

{

1 4000

1 FFFF

Page 1

Upper

48K

External

2 4000

2 FFFF

Page 2

Upper

48K

External

. . .

F 4000

F FFFF

Page 15

Upper

48K

External

† See Figure 1

‡ The lower 16K words of pages 1 through 15 are available only when the OVLY bit is cleared to 0. If the OVLY bit is set to 1, the on-chip RAM

is mapped to the lower 16K words of all program space pages.

Figure 2. Extended Program Memory

TMS320UC5402 Datasheet(PDF) 12 Page - Texas Instruments

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