Zilog Z8F0130 Manual de usuario descargar pdf (Pagina 33)

eZ8

™

CPU Core

User Manual

UM012820-0810 Address Space

specific to your Z8 Encore! device to determine the number of registers

available in the Register File as well as descriptions of the peripheral and

I/O control registers.

CPU Control Registers

Within the 256 registers reserved for control, there are four eZ8 CPU con-

trol registers that are always at the same register addresses. These four

eZ8 CPU control registers (see Table 6) are the Stack Pointer High Byte,

Stack Pointer Low Byte, Register Pointer and Flags registers. For more

information on the operation of the eZ8 CPU control registers, see Archi-

tectural Overview on page 1.

General-Purpose Registers

Other than the upper 256 registers reserved for control functions, all other

available addresses within the Register File are available for 

general-purpose use. Refer to the Zilog Product Specification specific to

your Z8 Encore! device to determine the addresses available.

The Register File can be accessed as a 4096 byte linear address space

using 12-bit addressing mode, as sixteen 256-byte Register Pages using 

8-bit addressing mode, or as sixteen 16-byte Working Register Groups per

Table 6. eZ8 CPU Control Registers

Mnemonic Register Description

Address

(Hex)

FLAGS Flags FFC

RP Register Pointer FFD

SPH Stack Pointer High Byte FFE

SPL Stack Pointer Low Byte FFF

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 313 314

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Zilog Z8F0130 Manual de usuario Pagina 33