HD6805S6

      The HD6805S6 is the 8-bit microcomputer unit (MCU) which contains a CPU,on-chip clock,ROM,RAM,I/O and timer.HD6805S6 is designed for use who needs an economical microcomputer with the proven capabilities of the HD 6800-based instruction set.
      The following are some of the hardware and software highlights of the HD6805S6 MCU.First is about the hardware feature.It has 8-bit architecture,64 bytes of RAM,memory mapped I/O,1804 bytes of user ROM and internal 8-bit timer with 7-bit prescaller.There are 20 TTL/CMOS compatible I/O lines and 8 lines LED compatible.On-chip clock circuit,self-check mode,master reset,low voltage inhibit are notable features.What's more,it is easy for system development and debugging and is compatible with MC6805P6.Then is about the software features.It is similar to HD6800 and easy to program.Byte efficient instruction set,true bit manipulation,bit test and branch instruction,versatile interrupt function are distinct characteristics.It is powerful indexed addressing for tables and has full set of conditional branches.It has single instruction memory examine/change and 10 powerful addressing modes.Besides,all addressing modes apply to ROM,RAM and I/O.It is compatible with MC6805P6.
      What comes next is about the absolute maximum ratings of HD6805S6.The supply voltage (V_CC) is from -0.3 to 7.0V.The input voltage (except timer) (V_IN) is from -0.3 to +7.0V and the input voltage (timer) (V_IN) is from -0.3 to +12.0V.The operating temperature (T_opr) is from 0 to +70.The storage temperature (T_stg) is from -55 to +150.Then is about the DC characteristics (V_CC=5.25 V±0.5 V,V_SS=GND,Ta=0 to 70).The maximum power dissipation (P_D) is 700mW.The maximum low voltage recover (L_VR) is 4.75V and the typical low voltage inhibit (L_VI) is 4.0 V.Next is about some AC characteristics (V_CC=5.25 V±0.5 V,V_SS=GND,Ta=0 to 70).The minimum clock frequency (f_cl) is 0.4 MHz and the maximum is 4.0 MHz.The minimum cycle time (t_cyc) is 1.0s and the maximum is 10s.The typical oscillation frequency (External Resistor Mode) (f_EXT) is 3.4 MHz at R_CP=15.0k.