beautypg.com

Data indirect with displacement, Data indirect, Data indirect with pre- decrement – Rainbow Electronics AT90S8515 User Manual

Page 15

background image

15

AT90S8515

0841G–09/01

A 16-bit data address is contained in the 16 LSBs of a 2-word instruction. Rd/Rr specify
the destination or source register.

Data Indirect with
Displacement

Figure 13. Data Indirect with Displacement

Operand address is the result of the Y- or Z-register contents added to the address con-
tained in six bits of the instruction word.

Data Indirect

Figure 14. Data Indirect Addressing

Operand address is the contents of the X-, Y-, or the Z-register.

Data Indirect with Pre-
decrement

Figure 15. Data Indirect Addressing with Pre-decrement