ZUSBOPTSC01ZACG datasheet(32/282 Pages) ZILOG

32 / 282 page

PS022827-1212

P R E L I M I N A R Y

Address Space

Z8 Encore! XP® F082A Series

Product Specification

Address Space

The eZ8 CPU can access the following three distinct address spaces:

•

The Register File contains addresses for the general-purpose registers and the eZ8

CPU, peripheral and general-purpose I/O port control registers.

•

The Program Memory contains addresses for all memory locations having executable

code and/or data.

•

The Data Memory contains addresses for all memory locations that contain data only.



These three address spaces are covered briefly in the following subsections. For more

information about eZ8 CPU and its address space, refer to the eZ8 CPU Core User Manual

(UM0128), which is available for download on www.zilog.com.

The Register File address space in the Z8 Encore! MCU is 4 KB (4096 bytes). The Regis-

ter File is composed of two sections: control registers and general-purpose registers. When

instructions are executed, registers defined as sources are read and registers defined as

destinations are written. The architecture of the eZ8 CPU allows all general-purpose regis-

ters to function as accumulators, address pointers, index registers, stack areas, or scratch

pad memory.

The upper 256 bytes of the 4 KB Register File address space are reserved for control of the

eZ8 CPU, the on-chip peripherals and the I/O ports. These registers are located at

addresses from F00H to FFFH. Some of the addresses within the 256 B control register

section are reserved (unavailable). Reading from a reserved Register File address returns

an undefined value. Writing to reserved Register File addresses is not recommended and

can produce unpredictable results.

The on-chip RAM always begins at address 000H in the Register File address space. The

Z8 Encore! XP™ F082A Series devices contain 256 B to 1KB of on-chip RAM. Reading

from Register File addresses outside the available RAM addresses (and not within the con-

trol register address space) returns an undefined value. Writing to these Register File

addresses produces no effect.

Program Memory

The eZ8 CPU supports 64 KB of Program Memory address space. The Z8 Encore! XP

F082A Series devices contain 1 KB to 8KB of on-chip Flash memory in the Program

Memory address space, depending on the device. Reading from Program Memory

ZUSBOPTSC01ZACG 数据表(PDF) 32 Page - Zilog, Inc.

ZUSBOPTSC01ZACG 数据表(HTML) 32 Page - Zilog, Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载