HT83C51 Honeywell Microelectronics & Precision Sensors, HT83C51 Datasheet
HT83C51
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HT83C51 Summary of contents
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... Automatic Address Recognition • 64K External Program Memory Address Space GENERAL DESCRIPTION The HT83C51 is a monolithic 8-bit microcontroller that is pin equivalent to the Intel 8XC51FC microcontroller. Fab- ricated with Honeywell’s dielectrically isolated high-tem- perature (HTMOS™) process designed specifically for severe high-temperature applications such as down-hole oil well, aerospace, turbine engine and industrial control ...
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... 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 Function Registers, ALU Timers, PCA, Serial Port TMP3 ...
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... 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. XTAL1: Input to the inverting oscillator amplifier. XTAL2: Output from the inverting oscillator amplifier. 3 HT83C51 ...
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... HT83C51 OSCILLATOR CHARACTERISTICS The input is XTAL1 and the output is XTAL2 for an inverting amplifier which can be used as an on-chip oscillator as shown in Figure 1. Make sure to qualify the crystal or alternate timing source over the temperature range of the intended application external clock source such as the HTOSC is used, XTAL1 should be driven while XTAL2 floats as shown in Figure 2 ...
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... V occurs. Timing diagrams are shown to illustrate the signal relationships depicted in the tables. 5 HT83C51 Q: OutputData R: RDn signal T: Time V: Valid W: WRn signal ...
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... HT83C51 DC CHARACTERISTICS (1) Under steady state (non-transient conditions, IOL must be limited externally as follows: maximum IOL per port pin maximum IOL per 8-bit port – port 0 – port 1,2,3 maximum total IOL for all output pins (2) If IOL exceeds the test conditions, VOL may exceed the related specifications. ...
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... RDn Low to Address Float TWHLH RDn or WRn High to ALE High Min 62.5 2 TCLCL-40 TCLCL-40 TCLCL-30 4 TCLCL-100 TCLCL-30 3 TCLCL-45 3 TCLCL-105 0 5 TCLCL-105 6 TCLCL-100 6 TCLCL-100 5 TCLCL-165 0 2 TCLCL-60 8 TCLCL-150 9 TCLCL-165 3 TCLCL-50 3 TCLCL+50 4 TCLCL-130 TCLCL-50 TCLCL-50 7 TCLCL-150 TCLCL-40 7 HT83C51 Max Unit ns 16 MHz TCLCL- ...
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... 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 ALE TLHLL PSENn WRn TAVLL from RI or DPL PORT 0 ...
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... TQVXH OUTPUT DATA (WRITE TO SBUF) TXHDX TXHDV INPUT VALID VALID VALID DATA (CLEAR RI) 16 MHz Oscillator Min Max 750 492 8 0 492 SET TI VALID VALID VALID VALID VALID SET RI 9 HT83C51 Variable Oscillator Unit Min Max 12 TCLCL 10 TCLCL-133 2 TCLCL-117 0 10 TCLCL-133 ...
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... HT83C51 PERFORMANCE CURVES OVER TEMPERATURE -100 0 100 Temperature ( C) Maximum frequency vs. temperature Frequency (MHz) Operating current vs. frequency vs. temperature 5.0 4.8 4.6 4.4 4.2 4.0 3.8 3.6 3.4 3.2 3.0 -100 200 300 - 125 C 225 7mA 0 100 200 Temperature (C) Output drive vs. temperature 300 ...
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... 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 Hon- eywell for metal programming of these memory locations. ...
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... Rev. B 4-98 D Right Reading E on Lid (pitch) Assumes static air convection jc ................................... 0.9 C/W ja .................................. 32.8 C/W HT83C51DC C - Indicates screening level B = High Temperature Class Commercial C All dimensions in inches A 0.175 (max) b 0.018 ± 0.002 eA b2 0.050 typ C 0.010 ± 0.002 D 2.000 ± ...