CC2430 Datasheet, PDF (41/234 Pages) Texas Instruments – A True System-on-Chip solution for 2.4 GHz IEEE 802.15.4 / ZigBee-TM

CC2430
12.3.3 Data Pointers
The CC2430 has two data pointers, DPTR0
and DPTR1 to accelerate the movement of
data blocks to/from memory. The data pointers
are generally used to access CODE or XDATA
space e.g.
MOVC A,@A+DPTR
MOV A,@DPTR.
The data pointer select bit, bit 0 in the Data
Pointer Select register DPS, chooses which
data pointer shall be the active one during
execution of an instruction that uses the data
pointer, e.g. in one of the above instructions.
The data pointers are two bytes wide
consisting of the following SFRs:
• DPTR0 – DPH0:DPL0
• DPTR1 – DPH1:DPL1
DPH0 (0x83) – Data Pointer 0 High Byte
Bit Name
7:0 DPH0[7:0]
Reset R/W Description
0
R/W Data pointer 0, high byte
DPL0 (0x82) – Data Pointer 0 Low Byte
Bit Name
7:0 DPL0[7:0]
Reset R/W Description
0
R/W Data pointer 0, low byte
DPH1 (0x85) – Data Pointer 1 High Byte
Bit Name
7:0 DPH1[7:0]
Reset R/W Description
0
R/W Data pointer 1, high byte
DPL1 (0x84) – Data Pointer 1 Low Byte
Bit Name
7:0 DPL1[7:0]
Reset R/W Description
0
R/W Data pointer 1, low byte
DPS (0x92) – Data Pointer Select
Bit Name
7:1 -
0 DPS
Reset R/W
0x00 R0
0
R/W
Description
Not used
Data pointer select. Selects active data pointer.
0 : DPTR0
1 : DPTR1
12.3.4 XDATA Memory Access
The CC2430 provides an additional SFR
register MPAGE. This register is used during
instructions MOVX A,@Ri and MOVX @Ri,A.
MPAGE gives the 8 most significant address
bits, while the register Ri gives the 8 least
significant bits.
In some 8051 implementations, this type of
XDATA 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.
CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A
Page 41 of 232