AT89C51CC03U-RDRIM Atmel, AT89C51CC03U-RDRIM Datasheet - Page 26

IC 8051 MCU FLASH 64K 64VQFP

AT89C51CC03U-RDRIM

Manufacturer Part Number
AT89C51CC03U-RDRIM
Description
IC 8051 MCU FLASH 64K 64VQFP
Manufacturer
Atmel
Series
AT89C CANr

Specifications of AT89C51CC03U-RDRIM

Core Processor
8051
Core Size
8-Bit
Speed
40MHz
Connectivity
CAN, SPI, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
36
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
2.25K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
AT89C51CC03URDRTR

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AT89C51CC03U-RDRIM
Manufacturer:
Atmel
Quantity:
10 000
Dual Data Pointer
Description
Application
26
AT89C51CC03
The AT89C51CC03 implements a second data pointer for speeding up code execution
and reducing code size in case of intensive usage of external memory accesses.
DPTR 0 and DPTR 1 are seen by the CPU as DPTR and are accessed using the SFR
addresses 83h and 84h that are the DPH and DPL addresses. The DPS bit in AUXR1
register (see Figure 8) is used to select whether DPTR is the data pointer 0 or the data
pointer 1 (see Figure 13).
Figure 13. Dual Data Pointer Implementation
Software can take advantage of the additional data pointers to both increase speed and
reduce code size, for example, block operations (copy, compare…) are well served by
using one data pointer as a “source” pointer and the other one as a “destination” pointer.
Hereafter is an example of block move implementation using the two pointers and coded
in assembler. The latest C compiler takes also advantage of this feature by providing
enhanced algorithm libraries.
The INC instruction is a short (2 Bytes) and fast (6 machine cycle) way to manipulate the
DPS bit in the AUXR1 register. However, note that the INC instruction does not directly
force the DPS bit to a particular state, but simply toggles it. In simple routines, such as
the block move example, only the fact that DPS is toggled in the proper sequence mat-
ters, not its actual value. In other words, the block move routine works the same whether
DPS is '0' or '1' on entry.
; ASCII block move using dual data pointers
; Modifies DPTR0, DPTR1, A and PSW
; Ends when encountering NULL character
; Note: DPS exits opposite to the entry state unless an extra INC AUXR1 is added
AUXR1EQU0A2h
move:movDPTR,#SOURCE ; address of SOURCE
mv_loop:incAUXR1; switch data pointers
end_move:
incAUXR1 ; switch data pointers
movDPTR,#DEST ; address of DEST
movxA,@DPTR; get a byte from SOURCE
incDPTR; increment SOURCE address
incAUXR1; switch data pointers
movx@DPTR,A; write the byte to DEST
incDPTR; increment DEST address
jnzmv_loop; check for NULL terminator
DPTR1
DPTR0
DPH0
DPH1
DPL0
DPL1
DPS
0
1
0
1
AUXR1.0
DPH
DPL
4182O–CAN–09/08
DPTR

Related parts for AT89C51CC03U-RDRIM