Kawasaki 80C152, KS152JB, 80C51 technical specifications XTAL1, XTAL2, Rst

KS152JB Universal Communications Controller Technical Specifications

	Table 1: PIN DESCRIPTION
Port 3	Port 3 is an 8-bit bi-directional I/O port with internal pullups. Port 3 pins that have
	1s written to them are pulled high by the internal pullups, and in that state can be
	used as inputs. As inputs, Port 3 pins that are externally being pulled low will
	source current (IIL, on the data sheet) because of the pullups. Port 3 also serves the
	functions of various special features of the MCS-51 Family, as listed below:

	Pin	Name			Alternate Function
	P3.0		RXD		Serial input line
	P3.1		TXD		Serial output line
	P3.2				External interrupt 0
			INT0
	P3.3				External interrupt 1
			INT1
	P3.4		T0		Timer 0 external input
	P3.5		T1		Timer 1 external input
	P3.6				External Data Memory Write strobe
			WR
	P3.7				External Data Memory Read strobe
				RD
Port 4	Port 4 is an 8-bit bi-directional I/O port with internal pullups. Port 4 pins that have
	1s written to them are pulled high by the internal pullups, and in that state can be
	used as inputs. As inputs, Port 4 pins that are externally being pulled low will
	source current (IIL, on the data sheet) because of the internal pullups. In addition,
	Port 4 also receives the low-order address bytes during program verification.
Port 5	Port 5 is an 8-bit bi-directional I/O port with internal pullups. Port 5 pins that have
	1s written to them are pulled high by the internal pullups, and in that state can be
	used as inputs. As inputs, Port 5 pins that are externally being pulled low will
	source current (IIL, on the data sheet) because of the internal pullups.
	Port 5 is also the multiplexed low-order address and data bus during accesses to
	external program memory if EBEN is puled high. In this application it uses strong
	pullups when emitting 1s.
Port 6	Port 6 is an 8-bit bi-directional I/O port with internal pullups. Port 6 pins that have
	1s written to them are pulled high by the internal pullups, and in that state can be
	used as inputs. As inputs, Port 6 pins that are externally pulled low will source
	current (ILL, on the data sheet) because of the internal pullups. Port 6 emits the
	high-order address byte during fetches from external Program Memory if EBEN
	is pulled high. In this application it uses strong pullups when emitting 1s.
XTAL1	Input to the inverting oscillator amplifier and input to the internal clock generating
	circuits.
XTAL2	Output from the oscillator amplifier.
	Reset input. A logic low on this pin for three machine cycles while the oscillator is
RST
	running resets the device. An internal pullup resistor permits a power on reset to
	be generated using only an external capacitor to VSS. Although the GSC recog-
	nizes the reset after three machine cycles, data may continue to be transmitted for
	up to 4 machine cycles after Reset is first applied.

Kawasaki LSI USA, Inc. Page 4 of 120 Ver. 0.9 KS152JB2