βP14104

The βP14104 is a 4-bit expandable program counter of the βP 14000 series of IPRS Băneasa, for the programmable controllers built around the βP14500 1-bit controller [1].

The I.P.R.S. Băneasa Full Line Condensed Catalog (1990) describes the βP14104 and βPC14104 as the program counter of the programmable controllers built with the 14000 series; they have a 4-bit word length and can be connected in a serial mode to obtain an extended 8, 12, 16 … bit program counter [1]. Selected with the JS and RT control inputs, the counter works as a 4-bit synchronous counter with carry (Cn, Cn+4), performs the JUMP function (to a specified address) and the SUBROUTINE CALL function (CALL/RTN, βP14104 only), with two levels of nested subroutines [1]. In a controller, several βP14104 address the program memory: e.g. three of them can address 2¹² = 4096 memory locations [2].

By the catalog’s table of basic characteristics, the βP14104 works with a clock frequency of 1.0 MHz at −40…+85 °C from a 4.5…5.5 V supply, and the βPC14104 with 200 kHz at 0…+70 °C from 4.75…5.25 V, both in an MP-117 package (16 pins: 1 RST, 2 Cn, 3–6 Q3…Q0, 7 X1, 8 GND, 9 JS, 10 RT, 11–14 I0…I3, 15 Cn+4, 16 VCC) [1].

Function table (X = low or high level; * = βP14104 only) [1]:

RST	Cn	RT	JS	Function	Symbol
0	0	0	0	no operation	NOP
0	1	0	0	increment	INC
0	X	0	1	subroutine call	CALL *
0	X	1	0	return from subroutine	RTN *
0	X	1	1	jump	JMP
1	X	X	X	reset	RST