z16f2811 ZiLOG Semiconductor, z16f2811 Datasheet - Page 36

• Manufacturer Part Number: z16f2811
• Description: High Performance Microcontrollers
• Manufacturer: ZiLOG Semiconductor

External Memory
Endianness
PS022006-0207
Table 5. ZNEO CPU Control Registers
Many ZNEO CPU products support external data and address buses for connecting to
additional external memories and/or memory-mapped peripherals. The external addresses
are used for storing program code, data, constants, and stack, etc. Attempts to read from or
write to unavailable external addresses is undefined.
The ZNEO CPU accesses data in big endian order, that is, the address of a multi-byte word
or quad points to the most significant byte.
ZNEO CPU.
Address (Hex)
FF_E004-FF_E007
FF_E00C-FF_E00F
FF_E010
FF_E012
Figure 7. Endianness of Words and Quads
Address
of Word
Address
of Quad
P R E L I M I N A R Y
Register Description
Program counter overflow
Stack pointer overflow
Flags
CPU control
MSB
MSB
LSB
LSB
00_0081H
00_0080H
00_0083H
00_0082H
00_0081H
00_0080H
Figure 7
illustrates the Endianness of the
Register Mnemonic
PCOV
SPOV
FLAGS
CPUCTL
Product Specification
ZNEO
™
Address Space
Z16F Series
22