Zilog Z86193 Manual do Utilizador descarregar pdf (Página 237)

CPU

User Manual

UM001604-0108 Instruction Description

230

group of 16 registers. Registers F0h to FFh can be accessed as Working Registers R0 to

R15.

Example 3

The statement:

SRP 0Fh

Op Code: 31 0F

sets the Register Pointer to access Expanded Register Bank F, Reg ← to Reg 0Fh, as the

current Working Registers. All references to Working Registers now affect this group of

16 registers. These registers are now accessed as Working Registers R0 to R15. Port Reg-

isters are now not accessable.

Example 4

Assume the RP currently addresses the Control and Peripheral Working Register Group

and the program has just entered an interrupt service routine. The statement:

SRP 70h

Op Code: 31 70

retains the contents of the Control and Peripheral Registers by setting the RP to 70h

(

01110000b). Any reference to Working Registers in the interrupt routine points to regis-

ters

70h to 7Fh.

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Zilog Z86193 Manual do Utilizador Página 237