Introduction; Register File Space - ZiLOG Z8 PLUS User Manual

INTRODUCTION

Two address spaces are available for the Z8
Register file RAM contains addresses for all the control registers and all the general purpose registers.
Program memory contains addresses for all memory locations where executable code and/or data are stored.

REGISTER FILE SPACE

The on-chip register file RAM is organized into 16 pages, where each page has 256 addressable memory loca-
tions. The first page (page 0) contains both control registers and general purpose registers. All the remaining
pages (pages 1 through 15) contain only general purpose registers. Figure 1-1 illustrates the complete register
file RAM space. As shown, control registers are located in the upper half of page 0. Any specific implemen-
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tation of the Z8 core may use only a subset of the complete register file RAM space.
Table 1-1 describes the Core Control Registers and Table 1-2 shows the Page 0 Register File organization.
All registers on the Z8
or bits under some conditions. The TCTLHI register is one such example.
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-family products are fully read/writable. Hardware may write lock certain registers
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MCU: