P89LPC9151FDH datasheet(60/91 Pages) NXP

60 / 91 page

P89LPC9151_61_71_2

Product data sheet

Rev. 02 — 9 February 2010

60 of 91

NXP Semiconductors

P89LPC9151/9161/9171

8-bit microcontroller with 8-bit ADC

board area. The ICP function uses five pins. Only a small connector needs to be available

to interface your application to a commercial programmer in order to use this feature.

Additional details may be found in the P89LPC9151/9161/9171 User manual.

7.28.7 IAP-Lite

IAP-Lite is performed in the application under the control of the microcontroller’s firmware.

The IAP facility consists of internal hardware resources to facilitate programming and

erasing. The IAP-Lite operations are accomplished through the use of four SFRs

consisting of a control/status register, a data register, and two address registers.

Additional details may be found in the P89LPC9151/9161/9171 User’s Manual.

7.29 User configuration bytes

Some user-configurable features of the P89LPC9151/9161/9171 must be defined at

power-up and therefore cannot be set by the program after start of execution. These

features are configured through the use of the flash byte UCFG1 and UCFG2. Please see

the P89LPC9151/9161/9171 User’s Manual for additional details.

7.30 User sector security bytes

There are 8 User Sector Security Bytes on the P89LPC9151/9161/9171. Each byte

corresponds to one sector. Please see the P89LPC9151/9161/9171 User manual for

additional details.

ADC

8.1 General description

The P89LPC9151/9161/9171 devices have a single 8-bit, 4-channel multiplexed

analog-to-digital converter. A block diagram of the A/D converter is shown in Figure 21.

The A/D consists of a 4-input multiplexer which feeds a sample-and-hold circuit providing

an input signal to one of two comparator inputs. The control logic in combination with the

SAR drives a digital-to-analog converter which provides the other input to the comparator.

The output of the comparator is fed to the SAR.

8.2 Features

8-bit, 4-channel multiplexed input, successive approximation ADC.

Four A/D result registers.

Six operating modes:

Fixed channel, single conversion mode.

Fixed channel, continuous conversion mode.

Auto scan, single conversion mode.

Auto scan, continuous conversion mode.

Dual channel, continuous conversion mode.

Single step mode.

Three conversion start modes:

Timer triggered start.

Start immediately.

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