Datasheet

 2011 Microchip Technology Inc. DS39932D-page 285
PIC18F46J11 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 T
CY for FOSC/4, 9 TCY for FOSC/16
and 15 T
CY for FOSC/64. Additional delays 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 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
DLYCYC3 DLYCYC2 DLYCYC1 DLYCYC0 INTLVL3 INTLVL2 INTLVL1 INTLVL0
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 7-4 DLYCYC<3:0>: Delay Cycle Selection bits
When DLYINTEN = 0, these bits specify the additional delay (above the base overhead of the
hardware) in number of T
CY cycles before the SSP2BUF register is written again for the next transfer.
When DLYINTEN = 1, these bits specify the additional delay in number of T
CY cycles from the latest
completed transfer before an interrupt to the CPU is invoked. In this case, the delay before the
SSP2BUF register is written again is 1 T
CY + (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