DSPIC30F3010-30I/SO Microchip Technology Inc., DSPIC30F3010-30I/SO Datasheet - Page 50
DSPIC30F3010-30I/SO
Manufacturer Part Number
DSPIC30F3010-30I/SO
Description
16 BIT MCU/DSP 28LD 30MIPS 24 KB FLASH
Manufacturer
Microchip Technology Inc.
Type
DSPr
Datasheet
1.DSPIC30F3010-30ISO.pdf
(244 pages)
Specifications of DSPIC30F3010-30I/SO
A/d Inputs
6-Channels, 10-Bit
Cpu Speed
30 MIPS
Eeprom Memory
1K Bytes
Input Output
20
Interface
I2C/SPI/UART, USART
Ios
20
Memory Type
Flash
Number Of Bits
16
Package Type
28-pin SOIC
Programmable Memory
24K Bytes
Ram Size
1K Bytes
Timers
5-16-bit, 2-32-bit
Voltage, Range
2.5-5.5
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Available stocks
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Quantity
Price
Part Number:
DSPIC30F3010-30I/SO
Manufacturer:
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dsPIC30F
FIGURE 4-2:
4.4.3
Modulo addressing can be applied to the effective
address (EA) calculation associated with any W regis-
ter. It is important to realize that the address bound-
aries check for addresses less than or greater than the
upper (for incrementing buffers) and lower (for decre-
menting buffers) boundary addresses (not just equal
to). Address changes may, therefore, jump over bound-
aries and still be adjusted correctly (see Section 4.4.4
for restrictions).
DS70082G-page 48
Note:
Byte
Address
0x11D0
0x11FF
MODULO ADDRESSING
APPLICABILITY
The modulo corrected effective address is
written back to the register only when Pre-
Modify or Post-Modify Addressing mode is
used to compute the Effective Address.
When an address offset (e.g., [W7+W2]) is
used, modulo address correction is per-
formed, but the contents of the register
remains unchanged.
Start Addr = 0x11D0
End Addr = 0x11FF
Length = 0x0018 words
DECREMENTING BUFFER MODULO ADDRESSING OPERATION EXAMPLE
MOV
MOV
MOV
MOV
MOV
MOV
MOV
MOV
DO
MOV
AGAIN: DEC
Preliminary
#0x11D0,W0
#0, XMODSRT
0x11FF,W0
W0,XMODEND
#0x8001,W0
W0,MODCON
#0x000F,W0
#0x11E0,W1
AGAIN,#0x17
W0, [W1--]
W0,W0
4.4.4
For an incrementing buffer the circular buffer start
address (lower boundary) is arbitrary, but must be at a
‘zero’ power-of-two boundary (see Section 4.4.1). For
a decrementing buffer, the circular buffer end address
is arbitrary, but must be at a ‘ones’ boundary.
There are no restrictions regarding how much an EA
calculation can exceed the address boundary being
checked and still be successfully corrected.
;set modulo start address
;set modulo end address
;enable W1, X AGU for modulo
;W0 holds buffer fill value
;point W1 to buffer
;fill the 24 buffer locations
;fill the next location
;decrement the fill value
MODULO ADDRESSING
RESTRICTIONS
2004 Microchip Technology Inc.
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