80C554 datasheet(26/76 Pages) PHILIPS

26 / 76 page

Philips Semiconductors

Preliminary specification

80C554/83C554/87C554

80C51 8-bit microcontroller – 6 clock operation

16K/512 OTP/ROM/ROMless, 7 channel 10 bit A/D, I2C, PWM,

capture/compare, high I/O, 64L LQFP

2000 Nov 10

(MSB)

(LSB)

AADR2 AADR1

AADR0

ADCON (C5H)

ADCON.7

ADC.1

Bit 1 of ADC result

Bit 0 of ADC result

Enable external start of conversion by STADC

0 = Conversion can be started by software only (by setting ADCS)

1 = Conversion can be started by software or externally (by a rising edge on STADC)

Bit

Symbol

Function

ADEX

ADCI ADCS

ADC.1

ADC.0

ADCON.6

ADC.0

ADCON.5

ADEX

ADC interrupt flag: this flag is set when an A/D conversion result is ready to be read. An interrupt is

invoked if it is enabled. The flag may be cleared by the interrupt service routine. While this flag is set,

the ADC cannot start a new conversion. ADCI cannot be set by software.

ADCON.4

ADCI

ADC start and status: setting this bit starts an A/D conversion. It may be set by software or by the

external signal STADC. The ADC logic ensures that this signal is HIGH while the ADC is busy. On

completion of the conversion, ADCS is reset immediately after the interrupt flag has been set. ADCS

cannot be reset by software. A new conversion may not be started while either ADCS or ADCI is high.

ADCON.3

ADCS

ADCI

ADCS

ADC Status

ADC not busy; a conversion can be started

ADC busy; start of a new conversion is blocked

Conversion completed; start of a new conversion requires ADCI=0

ADCON.2

AADR2

ADCON.1

AADR1

ADCON.0

AADR0

Analogue input select: this binary coded address selects one of the

eight analogue port bits of P5 to be input to the converter. It can only

be changed when ADCI and ADCS are both LOW.

AADR2

AADR1

Selected Analog Channel

ADC0 (P5.0)

ADC1 (P5.1)

AADR0

ADC2 (P5.2)

ADC3 (P5.3)

ADC4 (P5.4)

ADC5 (P5.5)

ADC6 (P5.6)

If ADCI is cleared by software while ADCS is set at the same time, a new A/D conversion with the

same channel number may be started.

But it is recommended to reset ADCI

before ADCS is set.

SU01468

Reset Value = xx00 0000B

Figure 23. ADC Control Register (ADCON)

80C554 Datasheet(PDF) 26 Page - NXP Semiconductors

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