HT83C51DB ETC, HT83C51DB Datasheet
HT83C51DB
Related parts for HT83C51DB
HT83C51DB Summary of contents
Page 1
TM HTMOS High Temperature Products HIGH TEMPERATURE 83C51 MICROCONTROLLER FEATURES • HTMOS Specified Over -55 to +225 C • 8-bit CPU Optimized For 5 Volt Control Applications • Four 8-bit Bidirectional Parallel Ports • Three 16-bit Timer/Counters with One Up/Down ...
Page 2
HT83C51 FUNCTIONAL BLOCK DIAGRAM B B Register Register PSENn ALE EAn RST Osc. XTAL1 XTAL2 P2.0 - P2.7 P0.0 - P0.7 Port O Port 2 Drivers Drivers Port O Port 2 RAM Latch Latch Stack ACC Pointer TMP2 TMP1 Special ...
Page 3
... EAn: External Access Enable. The EAn pin must be strapped to VSS for the HT51 to fetch code from external Program Memory locations 0000H to 1FFFH. The EAn pin must be strapped to VDD for internal program execution from memory locations 0000H to 1FFFH. ...
Page 4
... There are 8 Kbytes of internal program memory in the HT51. The EAn pin must be tied to Vdd (power) to enable access to internal program memory locations. When the EAn pin is tied to Vdd, program fetches to addresses 0000H to 1FFFH will be made to internal program ROM. Program fetches to addresses 2000H through FFFFH are to external memory ...
Page 5
PCA COUNTER /TIMER The Programmable Counter Array (PCA) contains a single 16-bit counter/timer made up of the CL and CH registers. This timer is used by all 5 capture/compare modules. Its clock input can be programmed to be from one ...
Page 6
HT83C51 DC CHARACTERISTICS ...
Page 7
EXTERNAL PROGRAM AND DATA MEMORY CHARATERISTICS Symbol Parameter TCLCL Clock Period 1/TCLCL Oscillator Frequency TLHLL ALE Pulse Width TAVLL Address Valid to ALE Low TLLAX Address hold after ALE low TLLIV ALE low to Valid Instruction In TLLPL ALE Low ...
Page 8
HT83C51 EXTERNAL PROGRAM MEMORY READ CYCLE TLHLL ALE TAVLL PSENn PORT 0 PORT 2 EXTERNAL DATA MEMORY READ CYCLE ALE TLHLL PSENn RDn TAVLL from RI or DPL PORT 0 PORT 2 EXTERNAL DATA MEMORY WRITE CYCLE ...
Page 9
SERIAL PORT TIMING CHARACTERISTICS—SHIFT REGISTER MODE (MODE 0) Symbol Parameter TXLXL Serial Port Clock Period TQVXH Output Data Setup to Clock Rising Edge TXHQX Output Data Hold after Clock Rising Edge TXHDX Input Data Hold after Clock Rising Edge TXHDV ...
Page 10
HT83C51 PERFORMANCE CURVES OVER TEMPERATURE -100 0 100 Temperature ( C) Maximum frequency vs. temperature Frequency (MHz) Operating current vs. frequency vs. temperature 5.0 ...
Page 11
PROGRAMMING THE MASK ROM The HT83C51 has 8K bytes of on-chip mask program- mable ROM. The part is usable with or without this memory space personalised. Once the designer’s code has been finalized, the ROM information can be transmitted to ...
Page 12
HT83C51 40-LEAD PACKAGE DETAIL 1 Ceramic Kovar Body Lid [ (width) THERMAL CHARACTERISTICS ORDERING INFORMATION D - Indicates package type Standard DIP *For packaging options, call Honeywell To learn more about Honeywell Solid ...