ATAM862 datasheet(17/110 Pages) ATMEL

17 / 110 page

4554E–4BMCU–05/06

ATAM862-3

Figure 16-2. RAM Map

16.3

Registers

The microcontroller has seven programmable registers and one condition code register (see

Figure 16-3).

16.3.1

Program Counter (PC)

The program counter is a 12-bit register which contains the address of the next instruction to be

fetched from the EEPROM. Instructions currently being executed are decoded in the instruction

decoder to determine the internal micro-operations. For linear code (no calls or branches), the

program counter is incremented with every instruction cycle. If a branch-, call-, return-instruction

or an interrupt is executed, the program counter is loaded with a new address. The program

counter is also used with the table instruction to fetch 8-bit wide EEPROM constants.

Figure 16-3. Programming Mode l

RAM

FCh

00h

Autosleep

FFh

03h

04h

TOS-1

Expression

stack

Return

stack

Global

variables

07h

(256 x 4-bit)

Global

variables

4-bit

TOS

TOS-1

TOS-2

Expression stack

Return stack

12-bit

TOS

CCR

Program counter

Return stack pointer

Expression stack pointer

RAM address register (X)

RAM address register (Y)

Top of stack register

Condition code register

Carry / borrow

Branch

Interrupt enable

Reserved

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