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83C749 Datasheet(PDF) 9 Page - NXP Semiconductors |
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83C749 Datasheet(HTML) 9 Page - NXP Semiconductors |
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9 / 22 page  Philips Semiconductors Preliminary specification 83C749/87C749 80C51 8-bit microcontroller family 2K/64 OTP/ROM, 5 channel 8-bit A/D, PWM, low pin count 1998 Apr 23 9 may always be used as digital inputs. Unselected analog inputs will be floating and may not be used as digital outputs. The A/D reference inputs on the 8XC749 are tied together with the analog supply pins AVCC and AVSS. This means that the reference voltage on the A/D cannot be varied separately from the analog supply pins. AVSS must be connected to 0V and AVCC must be connected to a supply voltage between 4.5V and 5.5V. A/D measurements may be made in the range of 4.5V to 5.5V. Increasing the voltage on the A/D ground reference above 0V or reducing the voltage on the positive A/D reference below 4.5V is not permitted. Table 2. 8XC749 Special Function Registers SYMBOL DESCRIPTION DIRECT ADDRESS BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION MSB LSB RESET VALUE ACC* Accumulator E0H E7 E6 E5 E4 E3 E2 E1 E0 00H ADAT# A/D result 84H 00H ADCON# A/D control A0H – – ENADC ADCI ADCS AADR2 AADR1 AADR0 C0H B* B register F0H F7 F6 F5 F4 F3 F2 F1 F0 00H DPTR: DPL DPH Data pointer (2 bytes) Data pointer low Data pointer high 82H 83H 00H 00H AF AE AD AC AB AA A9 A8 IE*# Interrupt enable ADH EA EAD ETI — EPWM EX1 ET0 EX0 00H – – – 84 83 82 81 80 P0*# Port 0 80H – – – PWM0 – – – – xxx11111B 97 96 95 94 93 92 91 90 FFH P1*# Port 1 90H T0 INT1 INT0 ADC4 ADC3 ADC2 ADC1 ADC0 P3* Port 3 B0H B7 B6 B5 B4 B3 B2 B1 B0 FFH PCON# Power control 87H – – – – – – PD IDL xxxx0000B D7 D6 D5 D4 D3 D2 D1 D0 PSW* Program status word D0H CY AC F0 RS1 RS0 OV – P 00H PWCM# PWM compare 8EH xxxxxxxxB PWENA# PWM enable FEH – – – – – – – PWE FEH PWMP# PWM prescaler 8FH 00H RTL# Timer low reload 8BH 00H RTH# Timer high reload 8DH 00H SP Stack pointer 81H 07H TL# Timer low 8AH 00H TH# Timer high 8CH 00H DF DE DD DC DB DA D9 D8 TICON*# Timer I control D8H/RD – – 0 TIRUN – – – – 0000xx00B WR – – CLRTI TIRUN – – – – 8F 8E 8D 8C 8B 8A 89 88 TCON*# Timer control 88H GATE C/T TF TR IE0 IT0 IE1 IT1 00H * SFRs are bit addressable. # SFRs are modified from or added to the 80C51 SFRs. |
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