IA88C00
Data Sheet
Microcontroller
As of Production Version -01
Set One
Set Two
FFH
FFH
Bank 1
Bank 0
Mode and Control Registers
(Register Addressing Only)
Data Registers
EOH
DFH
(Indirect Register, Indexed,
STACK or DMA Access Only)
System Register:
STACK, FLAGS, PORTS, etc.
(Register Addressing Only)
DOH
CFH
Working Register
(Working Register
Addressing Only)
COH
COH
256 Bytes
CFH
Data Registers
192 Bytes
(All Addressing Modes)
OOH
Figure 7. IA88C00Registers
Working Register Window
Working registers are those registers found within a moveable 8-register section of the register space.
These moveable 8-register sections are defined by register pointers RP0 and RP1, which are control
registers R214 and R215.
Short 4-bit addresses are used to access working registers. The process of accessing working registers,
shown in a section of Figure 7, occurs as follows:
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