ST90R158 datasheet(33/190 Pages) STMICROELECTRONICS

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ST90158 - DEVICE ARCHITECTURE

MMU REGISTERS (Cont’d)

DATA PAGE REGISTER 0 (DPR0)

R240 - Read/Write

Reset value: undefined

This register is relocated to R224 if EMR2.5 is set.

Bit 7:0 = DPR0_[7:0]: These bits define the 16-

Kbyte Data Memory page number. They are used

as the most significant address bits (A21-14) to ex-

tend the address during a Data Memory access.

The DPR0 register is used when addressing the

virtual address range 0000h-3FFFh.

DATA PAGE REGISTER 1 (DPR1)

R241 - Read/Write

Reset value: undefined

This register is relocated to R225 if EMR2.5 is set.

Bit 7:0 = DPR1_[7:0]: These bits define the 16-

Kbyte Data Memory page number. They are used

as the most significant address bits (A21-14) to ex-

tend the address during a Data Memory access.

The DPR1 register is used when addressing the

virtual address range 4000h-7FFFh.

DATA PAGE REGISTER 2 (DPR2)

R242 - Read/Write

Reset value: undefined

This register is relocated to R226 if EMR2.5 is set.

Bit 7:0 = DPR2_[7:0]: These bits define the 16-

Kbyte Data memory page. They are used as the

most significant address bits (A21-14) to extend

the address during a Data memory access. The

DPR2 register is involved when the virtual address

is in the range 8000h-BFFFh.

DATA PAGE REGISTER 3 (DPR3)

R243 - Read/Write

Reset value: undefined

This register is relocated to R227 if EMR2.5 is set.

Bit 7:0 = DPR3_[7:0]: These bits define the 16-

Kbyte Data memory page. They are used as the

most significant address bits (A21-14) to extend

the address during a Data memory access. The

DPR3 register is involved when the virtual address

is in the range C000h-FFFFh.

DPR0

DPR1

DPR2

DPR3

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