22.3 PTG Step Commands

Table 22-1. PTG Step Command Format and Description
Step Command Byte
STEPx[7:0]
CMD[3:0]				OPTION[3:0]
bit 7	bit 6	bit 5	bit 4	bit 3	bit 2	bit 1	bit 0


Step Command	CMD[3:0]	Command Description
`PTGCTRL`	`0000`	Execute the control command as described by the OPTION[3:0] bits.
`PTGADD`	`0001`	Add contents of the PTGADJ register to the target register as described by the OPTION[3:0] bits.
`PTGCOPY`	`0001`	Copy contents of the PTGHOLD register to the target register as described by the OPTION[3:0] bits.
`PTGSTRB`	`001x`	Copy the values contained in the bits, CMD[0]:OPTION[3:0], to the strobe output bits[4:0].
`PTGWHI`	`0100`	Wait for a low-to-high edge input from a selected PTG trigger input as described by the OPTION[3:0] bits.
`PTGWLO`	`0101`	Wait for a high-to-low edge input from a selected PTG trigger input as described by the OPTION[3:0] bits.
—	`0110`	Reserved; do not use.⁽¹⁾
`PTGIRQ`	`0111`	Generate individual interrupt request as described by the OPTION[3:0] bits.
`PTGTRIG`	`100x`	Generate individual trigger output as described by the bits, CMD[0]:OPTION[3:0].
`PTGJMP`	`101x`	Copy the values contained in the bits, CMD[0]:OPTION[3:0], to the PTGQPTR register and jump to that Step queue.
`PTGJMPC0`	`110x`	PTGC0 = PTGC0LIM: Increment the PTGQPTR register.
`PTGJMPC0`	`110x`	PTGC0 ≠ PTGC0LIM: Increment Counter 0 (PTGC0) and copy the values contained in the bits, CMD[0]:OPTION[3:0] to the PTGQPTR register, and jump to that Step queue.
`PTGJMPC1`	`111x`	PTGC1 = PTGC1LIM: Increment the PTGQPTR register.
`PTGJMPC1`	`111x`	PTGC1 ≠ PTGC1LIM: Increment Counter 1 (PTGC1) and copy the values contained in the bits, CMD[0]:OPTION[3:0], to the PTGQPTR register, and jump to that Step queue.
Note: In general, reserved commands or options will execute, but they do not have any effect (i.e., execute as a `NOP` instruction). Reserved options must not be used with the `PTGWHI`/`PTGWLO` commands.

Table 22-2. PTG Command Options
Step Command	OPTION[3:0]	Command Description
`PTGCTRL`⁽¹⁾	`0000`	`NOP`.
	`0001`	Reserved; do not use.
	`0010`	Disable Step delay timer (PTGSD).
	`0011`	Reserved; do not use.
	`0100`	Reserved; do not use.
	`0101`	Reserved; do not use.
	`0110`	Enable Step delay timer (PTGSD).
	`0111`	Reserved; do not use.
	`1000`	Start and wait for the PTG Timer0 to match the PTGT0LIM register.
	`1001`	Start and wait for the PTG Timer1 to match the PTGT1LIM register.
	`1010`	Wait for the software trigger (level, PTGSWT = `1`).
	`1011`	Wait for the software trigger (positive edge, PTGSWT = `0` to `1`).
	`1100`	Copy the PTGC0LIM register contents to the strobe output.
	`1101`	Copy the PTGC1LIM register contents to the strobe output.
	`1110`	Copy the PTGL0 register contents to the strobe output.
	`1111`	Generate the triggers indicated in the PTGBTE register.
`PTGADD`⁽¹⁾	`0000`	Add the PTGADJ register contents to the PTGC0LIM register.
	`0001`	Add the PTGADJ register contents to the PTGC1LIM register.
	`0010`	Add the PTGADJ register contents to the PTGT0LIM register.
	`0011`	Add the PTGADJ register contents to the PTGT1LIM register.
	`0100`	Add the PTGADJ register contents to the PTGSDLIM register.
	`0101`	Add the PTGADJ register contents to the PTGL0 register.
	`0110`	Reserved; do not use.
	`0111`	Reserved; do not use.
`PTGCOPY`⁽¹⁾	`1000`	Copy the PTGHOLD register contents to the PTGC0LIM register.
	`1001`	Copy the PTGHOLD register contents to the PTGC1LIM register.
	`1010`	Copy the PTGHOLD register contents to the PTGT0LIM register.
	`1011`	Copy the PTGHOLD register contents to the PTGT1LIM register.
	`1100`	Copy the PTGHOLD register contents to the PTGSDLIM register.
	`1101`	Copy the PTGHOLD register contents to the PTGL0 register.
	`1110`	Reserved; do not use.
	`1111`	Reserved; do not use.
`PTGWHI`⁽¹⁾ or `PTGWLO`⁽¹⁾	`0000`	PTGI0 (see Table 22-3 for input assignments).
	•••	•••
	`1111`	PTGI15 (see Table 22-3 for input assignments).
`PTGIRQ`⁽¹⁾	`0000`	Generate PTG Interrupt 0.
	•••	•••
	`0111`	Generate PTG Interrupt 7.
	`1000`	Reserved; do not use.
	•••	•••
	`1111`	Reserved; do not use.
`PTGTRIG`	`0000`	PTGO0 (see Table 22-4 for input assignments).
	`0001`	PTGO1 (see Table 22-4 for input assignments).
	•••	•••
	`1110`	PTGO30 (see Table 22-4 for input assignments).
	`1111`	PTGO31 (see Table 22-4 for input assignments).

Note:

All reserved commands or options will execute, but they do not have any affect (i.e., execute as a NOP instruction).

Table 22-3. PTG Input Descriptions
PTG Input Number	PTG Input Description
PTGI 0	Trigger Input from PWM1 ADC Trigger 2
PTGI 1	Trigger Input from PWM2 ADC Trigger 2
PTGI 2	Trigger Input from PWM3 ADC Trigger 2
PTGI 3	Trigger Input from PWM4 ADC Trigger 2
PTGI 4-6	Reserved
PTGI 7	Trigger Input from SCCP4
PTGI 8	Reserved
PTGI 9	Trigger Input from Comparator 1
PTGI 10	Reserved
PTGI 11	Reserved
PTGI 12	Trigger Input from CLC1
PTGI 13	Trigger Input ADC Done Group Interrupt
PTGI 14	Reserved
PTGI 15	Trigger Input from INT2 PPS

Table 22-4. PTG Output Descriptions
PTG Output Number	PTG Output Description
PTGO0 to PTGO11	Reserved
PTGO12	ADC TRGSRC[30]
PTGO13 to PTGO23	Reserved
PTGO24	PPS Output RP46
PTGO25	PPS Output RP47
PTGO26	PPS Input RP6
PTGO27	PPS Input RP7
PTGO28 to PTGO31	Reserved

Note: On the dsPIC33CK256MC006 family of devices, the PTG strobe output may request the conversion of an ADC channel indicated by the strobed data. This functionality is enabled by setting PTGEN (ADCON2L[11]) to 1 in the ADC control registers, and operates similarly to using CNVCHSEL (ADCON3L[5:0]) and CNVRTCH (ADCON3L[8]) to select and convert a channel. The difference is that effectively, upon each strobe output, CNVCHSEL is written with the strobed data and CNVRTCH is automatically asserted to request the conversion immediately. The regular functionality of CNVCHSEL and CNVRTCH is not available when PTGEN = 1.