4.2 Two-Wire Interface

Another possible interface is the Two-Wire In-Circuit Serial Programming™ (ICSP™) port. Table 4-2 lists the required pin connections. This interface uses the following two communication lines to transfer data to and from the PIC32 device being programmed:

Serial Program Clock (PGECx)
Serial Program Data (PGEDx)

These signals are described in the following two sections. Refer to the specific device data sheet for the connection of the signals to the chip pins.

Table 4-2. Two-Wire Interface Pins
Device Pin Name	Programmer Pin Name	Pin Type	Pin Description
MCLR	MCLR	Power	Programming enable
ENVREG⁽²⁾	N/A	Input	Enable for on-chip voltage regulator
V_DD, V_DDIO, V_BAT⁽²⁾ and AV_DD⁽¹⁾	V_DD	Power	Power supply
V_DDCORE⁽²⁾ and V_DDR1V8⁽²⁾	N/A	Power	Power supply for DDR interface
V_SS, V_SS1V8⁽²⁾ and AV_SS⁽¹⁾	V_SS	Power	Ground
V_CAP⁽²⁾	N/A	Power	CPU logic filter capacitor connection
PGECx	PGEC	Input	Primary programming pin pair: Serial clock
PGEDx	PGED	Input/Output	Primary programming pin pair: Serial data
Note: Ensure to connect all power supply and ground pins, including analog supplies (AV_DD) and ground (AV_SS). This pin is not available on all devices. Refer to the “Pin Diagrams” or “Pin Tables” section in the specific device data sheet to determine availability.

For more details on the connection of the signals to the device pins, refer to the specific device data sheet.

Serial Program Clock (PGECx)

PGECx is the clock that controls the updating of the TAP controller and the shifting of data through the Instruction or selected Data registers. PGECx is independent of the processor clock, with respect to both frequency and phase.

Serial Program Data (PGEDx)

PGEDx is the data input/output to the Instruction or selected Data Registers, it is also the control signal for the TAP controller. This signal is sampled on the falling edge of the PGECx for some TAP controller states.