Digi BL1800 user manual PD0 PD1

Table A-3. Jackrabbit Pinout Configurations (continued)

Pin	Rabbit 2000	Alternate Use	Jackrabbit Use
	Factory Default
PD0
PD1			Connected to control
			DA0
PD2			Connected to control
			DA0
	Bitwise or parallel
PD3
	programmable I/O,
PD4	can be driven or open-	ATXB output	Connected to control
	drain output		DA1
PD5		ARXB input	Connected to RS-485 IC
			data enable input
PD6		ATXA output
PD7		ARXA input
PE0		I0 output or INT0A input	HV0 output control
PE1		I1 output or INT1A input	HV1 output control
PE2		I2 output	HV2 output control
PE3		I3 output	HV3 output control
PE4	Bitwise or parallel	I4 output or external
		INT0B input
	programmable I/O
PE5		I5 output or external
		INT1B input
PE6		I6 output	Connected to A/D
			comparator output
PE7		I7 output or slave port	Connected to A/D
		chip select /SCS	comparator output
PCLK	Peripheral clock	Output
IOBEN	I/O buffer enable	Output
WDO	Watchdog output	Single low pulse output
STAT	Status	Output	Connected to
			programming port

As shown in Table A-3,pins PE4 and PE5 can instead be used as external INT0B and INT1B interrupts. Pins PD6 and PD7 can instead be used to access Serial Port A on the Rabbit 2000 microprocessor. Pins PB0 and PB1 can instead be used to access the clock on Serial Port B and Serial Port A of the Rabbit 2000 microprocessor.

The four output-only pins are located on PB6–PB7, PCLK, and IOBEN. PB7 can also be used with the slave port of the Rabbit 2000 microprocessor. The primary function of PCLK is as a peripheral clock or a peripheral clock ÷ 2, but PCLK can instead be used as a digital output. Similarly, IOBENB is an I/O buffer enable, but can instead be used as a digital output. STAT and WDO also have limited uses as digital outputs.

User’s Manual 67