DSPIC30F4012-20I/SO Microchip Technology, DSPIC30F4012-20I/SO Datasheet - Page 39

• Manufacturer Part Number: DSPIC30F4012-20I/SO
• Description: IC, DSC, 16BIT, 48KB 20MHZ, 5.5V, SOIC28
• Manufacturer: Microchip Technology
• Series: DsPIC30Fr

Specifications of DSPIC30F4012-20I/SO

• Core Frequency: 20MHz
• Embedded Interface Type: CAN, I2C, SPI, UART
• No. Of I/o's: 20
• Flash Memory Size: 48KB
• Supply Voltage Range: 2.5V To 5.5V
• Core Processor: dsPIC
• Core Size: 16-Bit
• Speed: 20 MIPS
• Connectivity: CAN, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, Motor Control PWM, QEI, POR, PWM, WDT
• Number Of I /o: 20
• Program Memory Size: 48KB (16K x 24)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Package: 28SOIC W
• Device Core: dsPIC
• Family Name: dsPIC30
• Maximum Speed: 20 MHz
• Operating Supply Voltage: 2.5|3.3|5 V
• Data Bus Width: 16 Bit
• Number Of Programmable I/os: 20
• Interface Type: CAN/I2C/SPI/UART
• On-chip Adc: 6-chx10-bit
• Number Of Timers: 5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT28SO-1 - SOCKET TRANSITION 28SOIC 300MIL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: DSPIC30F401220ISO

4.2.1
The Modulo Addressing scheme requires that a start and
end address be specified and loaded into the 16-bit Mod-
ulo Buffer Address registers: XMODSRT, XMODEND,
YMODSRT and YMODEND (see
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:
© 2010 Microchip Technology Inc.
Note:
determined
Address
0x1100
0x1163
Byte
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
by
the
MODULO ADDRESSING OPERATION EXAMPLE
difference
Table
3-3).
between
MOV
MOV
MOV
MOV
MOV
MOV
MOV
MOV
DO
MOV
AGAIN: INC W0,W0
the
#0x1100,W0
W0, XMODSRT
#0x1163,W0
W0,MODEND
#0x8001,W0
W0,MODCON
#0x0000,W0
#0x1110,W1
AGAIN,#0x31
W0, [W1++]
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 oper-
ate 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
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>.
dsPIC30F4011/4012
;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
Table
3-3). Modulo Addressing is
DS70135G-page 39