Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 171)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 JP Instruction

156

Attributes

Escaped Mode Addressing

Using Escaped Mode Addressing, address mode RR can specify a work-

ing register Pair. If the high nibble of the source or destination address is

Eh (1110b), a Working Register Pair is inferred. For example, if Working

Ch) is the preferred destina-

tion operand, use ECh as the destination operand in the Op Code. To

access Register Pairs with addresses

E0h to EFh, either set the Working

Group Pointer,

RP[7:4], to Eh or use indirect addressing.

Sample Usage

If Working Register Pair RR2 contains the value 3F45h, the following

statement replaces the contents of the PC with the value

3F45h and trans-

fers program control to that location.

JP @RR2



Object Code: C4 E2

2. The location of the JP IRR1 instruction is moved from its former Z8 CPU Op Code location at

30h.

Mnemonic Destination

Code

(Hex) Operand 1 Operand 2 Operand 3

JP DA 8D DA[15:8] DA[7:0] —

JP IRR1 C4 RR1 — —

1 2 ... 166 167 168 169 170 171 172 173 174 175 176 ... 313 314

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