PIC18F44J50-I Datasheet, PDF (283/562 Pages) Microchip Technology – 28/44-Pin, Low-Power, High-Performance USB Microcontrollers

PIC18F46J50 FAMILY
19.4.4.2 DMACON2
The DMACON2 register contains control bits for
controlling interrupt generation and inter-byte delay
behavior. The INTLVL<3:0> bits are used to select when
an SSP2IF interrupt should be generated.The function
of the DLYCYC<3:0> bits depends on the SPI operating
mode (Master/Slave), as well as the DLYINTEN setting.
In SPI Master mode, the DLYCYC<3:0> bits can be used
to control how much time the module will Idle between
bytes in a transfer. By default, the hardware requires a
minimum delay of: 8 TCY for FOSC/4, 9 TCY for FOSC/16
and 15 TCY for FOSC/64. Additional delay can be added
with the DLYCYC bits. In SPI Slave modes, the
DLYCYC<3:0> bits may optionally be used to trigger an
additional time-out based interrupt.
REGISTER 19-4: DMACON2: DMA CONTROL REGISTER 2 (ACCESS F86h)
R/W-0
DLYCYC3
bit 7
R/W-0
DLYCYC2
R/W-0
DLYCYC1
R/W-0
DLYCYC0
R/W-0
INTLVL3
R/W-0
INTLVL2
R/W-0
INTLVL1
R/W-0
INTLVL0
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-4
bit 3-0
DLYCYC<3:0>: Delay Cycle Selection bits
When DLYINTEN = 0, these bits specify the additional delay (above the base overhead of the hard-
ware) in number of TCY cycles before the SSP2BUF register is written again for the next transfer. When
DLYINTEN = 1, these bits specify the delay in number of TCY cycles from the latest completed transfer
before an interrupt to the CPU is invoked. In this case, the additional delay before the SSP2BUF
register is written again is 1 TCY + (base overhead of hardware).
1111 = Delay time in number of instruction cycles is 2,048 cycles
1110 = Delay time in number of instruction cycles is 1,024 cycles
1101 = Delay time in number of instruction cycles is 896 cycles
1100 = Delay time in number of instruction cycles is 768 cycles
1011 = Delay time in number of instruction cycles is 640 cycles
1010 = Delay time in number of instruction cycles is 512 cycles
1001 = Delay time in number of instruction cycles is 384 cycles
1000 = Delay time in number of instruction cycles is 256 cycles
0111 = Delay time in number of instruction cycles is 128 cycles
0110 = Delay time in number of instruction cycles is 64 cycles
0101 = Delay time in number of instruction cycles is 32 cycles
0100 = Delay time in number of instruction cycles is 16 cycles
0011 = Delay time in number of instruction cycles is 8 cycles
0010 = Delay time in number of instruction cycles is 4 cycles
0001 = Delay time in number of instruction cycles is 2 cycles
0000 = Delay time in number of instruction cycles is 1 cycle
INTLVL<3:0>: Watermark Interrupt Enable bits
These bits specify the amount of remaining data yet to be transferred (transmitted and/or received)
upon which an interrupt is generated.
1111 = Amount of remaining data to be transferred is 576 bytes
1110 = Amount of remaining data to be transferred is 512 bytes
1101 = Amount of remaining data to be transferred is 448 bytes
1100 = Amount of remaining data to be transferred is 384 bytes
1011 = Amount of remaining data to be transferred is 320 bytes
1010 = Amount of remaining data to be transferred is 256 bytes
1001 = Amount of remaining data to be transferred is 192 bytes
1000 = Amount of remaining data to be transferred is 128 bytes
0111 = Amount of remaining data to be transferred is 67 bytes
0110 = Amount of remaining data to be transferred is 32 bytes
0101 = Amount of remaining data to be transferred is 16 bytes
0100 = Amount of remaining data to be transferred is 8 bytes
0011 = Amount of remaining data to be transferred is 4 bytes
0010 = Amount of remaining data to be transferred is 2 bytes
0001 = Amount of remaining data to be transferred is 1 byte
0000 = Transfer complete
 2011 Microchip Technology Inc.
DS39931D-page 283