CC1010-RTR1 datasheet(20/152 Pages) TI

20 / 152 page

CC1010

SWRS047

Page 20 of 152

15.3 Memory Map

The

CC1010 memory map is shown in

Figure 3.

CC1010 has 2 blocks of RAM on chip. This

includes the 128 bytes Internal RAM and

the 2048 bytes External RAM. (The 2048-

byte RAM will be referred to as External

RAM, although it is on-chip. Direct access

to off-chip RAM is not implemented.)

Access to the internal RAM is performed

using the MOV instruction. MOV A, @Ri,

MOV @Ri, A and MOV @Ri, #data use

indirect addressing. MOV A, direct,

MOV Rn, direct, MOV direct, A,

MOV

direct,

Rn, MOV

direct,

direct and MOV direct, #data use

direct addressing. MOV @Ri, direct

uses indirect and direct addressing.

All direct addressing instructions can also

be used to access the SFRs.

CC1010 also

implements the option to access SFRs

indirectly, as described in the In Circuit

Debugging section on page 44.

CC1010 has

dual data pointers to external RAM,

provided in the 16 bit registers DPTR0 and

DPTR1 (SFRs DPH0, DPL0, DPH1 and

DPL1). If a high-level language compilator

is used, it should be set up to make use of

both pointers for better performance. The

data pointer is selected through DPS.SEL.

Access to the external RAM is performed

using the MOVX instruction and indirect

addressing using either the 16 bit data

pointers or the 8 bit registers R0 or R1

together with MPAGE. MOVX A, @DPTR

and

MOVX

@DPTR,

moves data to (from) the accumulator,

from (to) the address pointed to by the

currently selected data pointer.

The instructions MOVX A, @Ri and MOVX

@Ri,

moves data to (from) the

accumulator, from (to) the address given

by the memory page address register

MPAGE and the register Ri (R0 or R1).

MPAGE gives the 8 most significant

address bits, while the register Ri gives

the 8 least significant bits. In many 8051

implementations, this type of external

RAM access is performed using P2 to give

the most significant address bits. Existing

software may therefore have to be

adapted to make use of MPAGE instead of

P2.

The program memory can be read using

the MOVC A, @A+DPTR and MOVC A,

@A+PC instructions, which moves a byte

from the program memory address given

by A+DPTR or A+PC respectively. The

program memory can not be written using

MOV commands, but uses the method

described in the 8051 Flash Programming

section on page 42.

CC1010 also provides a possibility to stretch

the access cycle to external RAM, through

CKCON.MD(2:0) (see page 55). The

default value for CKCON.MD is "001". It is

recommended to set CKCON.MD to "000"

for faster RAM access.

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