Intel Microcontroller, 80C196NU, 8XC196NP manual Stack Pointer, CPU SFRs

8XC196NP, 80C196NU USER’S MANUAL

Address

03FFH

0100H

00FFH

0000H

Upper

Register File

Lower

Register File

Page 00H	Address
	03FFH

General-purpose

Register RAM

0100H

00FFH

General-purpose

Register RAM

	001AH
Stack Pointer	0019H
	0018H
CPU SFRs	0017H
	0000H

A0301-02

Figure 5-3. Register File Memory Map

Table 5-6 on page 5-11 lists the register file memory addresses. The RALU accesses the lower register file directly, without the use of the memory controller. It also accesses a windowed loca- tion directly (see “Windowing” on page 5-13). Only the upper register file and the peripheral SFRs can be windowed. Registers in the lower register file and registers being windowed can be accessed with direct addressing.

NOTE

The register file must not contain code. An attempt to execute an instruction from a location in the register file causes the memory controller to fetch the instruction from external memory.

5-10