Intel 8XC196MC, 8XC196MD, 8XC196MH manual Register File Memory Map, Address

MEMORY PARTITIONS

4.1.6Register File

The register file (Figure 4-1) is divided into an upper register file and a lower register file. The upper register file consists of general-purpose register RAM. The lower register file contains gen- eral-purpose register RAM along with the stack pointer (SP) and the CPU special-function regis- ters (SFRs).

Table 4-1 on page 4-2 lists the register file memory addresses. The RALU accesses the lower reg- ister file directly, without the use of the memory controller. It also accesses a windowed location directly (see “Windowing” on page 4-12). 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 register-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.

Address

02FFH

0100H

00FFH

0000H

Upper

Register File

Lower

Register File

	Address
	02FFH (MH)
General-purpose
Register RAM
	0200H
	01FFH (MC, MD)
	0100H
General-purpose	00FFH
Register RAM	001AH
Stack Pointer	0019H
	0018H
CPU SFRs	0017H
	0000H

A3066-02

Figure 4-1. Register File Memory Map

4-9