BU34440 Datasheet, PDF (7/7 Pages) Rohm – Single-chip 4-bit microcontroller for

Optical disc ICs
FHardware descriptions
(1) Operates on a single power supply (VDD=2.3 X
5.5V).
(2) Memory size
ROM: 4096 8 bits
RAM: 256 4 bits
(3) Instruction execution time (1 cycle instruction)
1.5µsec: (at 4MHz)
(4) Subroutine nesting : 8 levels
(5) Interrupts: 4 factors
External: 2 factors
Internal (timer / counter, serial I / O)
: 2 factors
(6) ROM data table function (data table area : 4kB)
BU34440
(7) Two energy-saving modes (STOP / HALT)
(8) Internal 8-bit timer counter
(9) Internal serial I / O, simplifying interface with at-
tached LSIs (LSB first)
(10) 14 programmable pull-up input / outputs
(11) 5 programmable pull-up inputs
FExternal dimensions (Units: mm)
107