P8044AH-R0117 datasheet(32/65 Pages) INNOVASIC

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IA8044/IA8344

Data Sheet

SDLC Communications Controller

March 30, 2010

IA211010112-04

http://www.Innovasic.com

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4.8

General CPU Registers

4.8.1

Accumulator (ACC)

Table 22 presents the Accumulator Register. Most instructions use the accumulator to hold the

operand. The mnemonics for accumulator-specific instructions refer to accumulator as A, not

ACC.

Table 22. Accumulator Register

ACC.7

ACC.6

ACC.5

ACC.4

ACC.3

ACC.2

ACC.1

ACC.0

4.8.2

B Register (B)

Table 23 presents the B register, which is used during multiply and divide instructions. It can also

be used as a scratch-pad register to hold temporary data.

Table 23. B Register

B.7

B.6

B.5

B.4

B.3

B.2

B.1

B.0

4.8.3

Program Status Word (PSW)

Table 24 presents program status word, which contains CPU status flags, register select bits, and

user flags.

Table 24. Program Status Word Register

RS1

RS0

–

Bit [7]—CY → (PSW.7) Carry flag for carry out of or into Bit [7]

Bit [6]—AC → (PSW.7) Auxiliary carry flag for carry out of or into Bit [3]

Bit [5]—F0 → (PSW.7) General purpose Flag 0 available for user

Bit [4]—RS1 → (PSW.7) Register bank select control Bit [1], used to select working

Bit [3]—RS0 → (PSW.7) Register bank select control Bit [0], used to select working

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