DSPIC30F5015-30I/PT Microchip Technology Inc., DSPIC30F5015-30I/PT Datasheet - Page 39

• Manufacturer Part Number: DSPIC30F5015-30I/PT
• Description: DSP, 16-Bit, 66 KB Flash, 2KB RAM, 52 I/O, TQFP-64
• Manufacturer: Microchip Technology Inc.
• Type: DSPr

Specifications of DSPIC30F5015-30I/PT

• A/d Inputs: 16-Channels, 10-Bit
• Cpu Speed: 30 MIPS
• Eeprom Memory: 1K Bytes
• Input Output: 52
• Interface: CAN, I2C, SPI, UART/USART
• Ios: 52
• Memory Type: Flash
• Number Of Bits: 16
• Package Type: 64-pin TQFP
• Programmable Memory: 66K Bytes
• Ram Size: 2K Bytes
• Timers: 5-16-bit, 2-32-bit
• Voltage, Range: 2.5-5.5
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

4.2.1
The Modulo Addressing scheme requires that a
starting and an ending address be specified and
loaded into the 16-bit Modulo Buffer Address registers:
XMODSRT, XMODEND, YMODSRT and YMODEND
(see Table 3-3).
The length of a circular buffer is not directly specified. It
is
corresponding start and end addresses. The maximum
possible length of the circular buffer is 32K words
(64 Kbytes).
FIGURE 4-1:
© 2007 Microchip Technology Inc.
Note:
Byte
Address
0x1100
0x1163
determined by the difference
START AND END ADDRESS
Y-space Modulo Addressing EA calcula-
tions assume word-sized data (LSb of
every EA is always clear).
Start Addr = 0x1100
End Addr = 0x1163
Length = 0x0032 words
MODULO ADDRESSING OPERATION EXAMPLE
between
MOV
MOV
MOV
MOV
MOV
MOV
MOV
MOV
DO
MOV
AGAIN: INC
the
#0x1100,W0
W0, XMODSRT
#0x1163,W0
W0,MODEND
#0x8001,W0
W0,MODCON
#0x0000,W0
#0x1110,W1
AGAIN,#0x31
W0, [W1++]
W0,W0
4.2.2
The Modulo and Bit-Reversed Addressing Control reg-
ister, MODCON<15:0>, contains enable flags, as well
as a W register field to specify the W Address registers.
The XWM and YWM fields select which registers will
operate with Modulo Addressing. If XWM = 15,
X RAGU and X WAGU Modulo Addressing are
disabled. Similarly, if YWM = 15, Y AGU Modulo
Addressing is disabled.
The X Address Space Pointer W register (XWM) to
which Modulo Addressing is to be applied, is stored in
MODCON<3:0> (see Table 3-3). Modulo Addressing is
enabled for X data space when XWM is set to any value
other than 15 and the XMODEN bit is set at
MODCON<15>.
The Y Address Space Pointer W register (YWM) to
which Modulo Addressing is to be applied, is stored in
MODCON<7:4>. Modulo Addressing is enabled for Y
data space when YWM is set to any value other than 15
and the YMODEN bit is set at MODCON<14>.
dsPIC30F5015/5016
;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 50 buffer locations
;fill the next location
;increment the fill value
W ADDRESS REGISTER
SELECTION
DS70149C-page 37