datasheet (3).pdf - EEWeb

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dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/X04 AND dsPIC33FJ128MCX02/X04 REGISTER 25-10: ALRMVAL (WHEN ALRMPTR = 00): ALARM MINUTES AND SECONDS VALUE REGISTER U-0 R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x — MINTEN MINONE bit 15 bit 8 U-0 R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x — SECTEN SECONE bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 15 Unimplemented: Read as ‘0’ bit 14-12 MINTEN: Binary Coded Decimal Value of Minute’s Tens Digit; contains a value from 0 to 5 bit 11-8 MINONE: Binary Coded Decimal Value of Minute’s Ones Digit; contains a value from 0 to 9 bit 7 Unimplemented: Read as ‘0’ bit 6-4 SECTEN: Binary Coded Decimal Value of Second’s Tens Digit; contains a value from 0 to 5 bit 3-0 SECONE: Binary Coded Decimal Value of Second’s Ones Digit; contains a value from 0 to 9 DS70291E-page 308 © 2011 Microchip Technology Inc.
dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/X04 AND dsPIC33FJ128MCX02/X04 26.0 PROGRAMMABLE CYCLIC REDUNDANCY CHECK (CRC) GENERATOR Note 1: This data sheet summarizes the features of the dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/X04 and dsPIC33FJ128MCX02/X04 family of devices. It is not intended to be a comprehensive reference source. To complement the information in this data sheet, refer to “Section 36. Programmable Cyclic Redundancy Check (CRC)” (DS70298) of the “dsPIC33F/PIC24H Family Reference Manual”, which is available from the Microchip web site 2: (www.microchip.com). Some registers and associated bits described in this section may not be available on all devices. Refer to Section 4.0 “Memory Organization” in this data sheet for device-specific register and bit information. The programmable CRC generator offers the following features: • User-programmable polynomial CRC equation • Interrupt output • Data FIFO FIGURE 26-1: CRC SHIFTER DETAILS PLEN DOUT XOR OUT IN BIT 0 p_clk 0 1 26.1 Overview The module implements a software configurable CRC generator. The terms of the polynomial and its length can be programmed using the CRCXOR bits (X) and the CRCCON bits (PLEN), respectively. EQUATION 26-1: CRC EQUATION x 16 x 12 x 5 + + + 1 To program this polynomial into the CRC generator, the CRC register bits should be set as shown in Table 26-1. TABLE 26-1: EXAMPLE CRC SETUP Bit Name Bit Value PLEN 1111 X 000100000010000 For the value of X, the 12th bit and the 5th bit are set to ‘1’, as required by the CRC equation. The 0th bit required by the CRC equation is always XORed. For a 16-bit polynomial, the 16th bit is also always assumed to be XORed; therefore, the X bits do not have the 0th bit or the 16th bit. The topology of a standard CRC generator is shown in Figure 26-2. 0 1 2 15 Hold X1 Hold X2 Hold X3 X15 Hold OUT IN BIT 1 p_clk CRC Shift Register 0 1 IN BIT 2 © 2011 Microchip Technology Inc. DS70291E-page 309 OUT p_clk CRC Write Bus 0 1 0 1 CRC Read Bus OUT IN BIT 15 p_clk
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