SC1200 datasheet(32/60 Pages) TI

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MSC1200

SBAS289E

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Reset Value

SFR 81H

SP.7

SP.6

SP.5

SP.4

SP.3

SP.2

SP.1

SP.0

07H

SP.7-0

Stack Pointer. The stack pointer identifies the location where the stack will begin. The stack pointer is incremented before

bits 7-0

every PUSH or CALL operation and decremented after each POP or RET/RETI. This register defaults to 07H after reset.

Data Pointer Low 0 (DPL0)

Stack Pointer (SP)

DPL0.7-0

Data Pointer Low 0. This register is the low byte of the standard 8051 16-bit data pointer. DPL0 and DPH0

bits 7-0

are used to point to non-scratchpad data RAM. The current data pointer is selected by DPS (SFR 86H).

Data Pointer High 0 (DPH0)

Reset Value

SFR 82H

DPL0.7

DPL0.6

DPL0.5

DPL0.4

DPL0.3

DPL0.2

DPL0.1

DPL0.0

00H

DPH0.7-0

Data Pointer High 0. This register is the high byte of the standard 8051 16-bit data pointer. DPL0 and DPH0

bits 7-0

are used to point to non-scratchpad data RAM. The current data pointer is selected by DPS (SFR 86H).

Data Pointer Low 1 (DPL1)

Reset Value

SFR 83H

DPH0.7

DPH0.6

DPH0.5

DPH0.4

DPH0.3

DPH0.2

DPH0.1

DPH0.0

00H

DPL1.7-0

Data Pointer Low 1. This register is the low byte of the auxiliary 16-bit data pointer. When the SEL bit (DPS.0)

bits 7-0

(SFR 86H) is set, DPL1 and DPH1 are used in place of DPL0 and DPH0 during DPTR operations.

Data Pointer High 1 (DPH1)

Reset Value

SFR 84H

DPL1.7

DPL1.6

DPL1.5

DPL1.4

DPL1.3

DPL1.2

DPL1.1

DPL1.0

00H

DPH1.7-0

Data Pointer High. This register is the high byte of the auxiliary 16-bit data pointer. When the SEL bit (DPS.0)

bits 7-0

(SFR 86H) is set, DPL1 and DPH1 are used in place of DPL0 and DPH0 during DPTR operations.

Data Pointer Select (DPS)

Reset Value

SFR 85H

DPH1.7

DPH1.6

DPH1.5

DPH1.4

DPH1.3

DPH1.2

DPH1.1

DPH1.0

00H

Reset Value

SFR 86H

SEL

00H

SEL

Data Pointer Select. This bit selects the active data pointer.

bit 0

0: Instructions that use the DPTR will use DPL0 and DPH0.

1: Instructions that use the DPTR will use DPL1 and DPH1.

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