PIC16F819 Datasheet

IC型号：
PIC16F819
PDF描述：
18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Tech...
文件大小：
68.31KB
PDF页数：
176页
芯片厂家：
MICROCHIP

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PIC16F818/819

11.4

A/D Conversions

11.4.1

A/D RESULT REGISTERS

Clearing the GO/DONE bit during a conversion will

abort the current conversion. The A/D Result register

pair will NOT be updated with the partially completed

A/D conversion sample. That is, the ADRESH:ADRESL

registers will continue to contain the value of the last

completed conversion (or the last value written to the

ADRESH:ADRESL registers). After the A/D conversion

is aborted, a 2-T

wait is required before the next

acquisition is started. After this 2-T

wait, acquisition

on the selected channel is automatically started. The

GO/DONE bit can then be set to start the conversion.

In Figure 11-3, after the GO bit is set, the first time

segment has a minimum of T

and a maximum of T

Note:

The GO/DONE bit should

NOT

be set in

the same instruction that turns on the A/D.

The ADRESH:ADRESL register pair is the location

where the 10-bit A/D result is loaded at the completion

of the A/D conversion. This register pair is 16 bits wide.

The A/D module gives the flexibility to left or right justify

the 10-bit result in the 16-bit result register. The A/D

Format Select bit (ADFM) controls this justification.

Figure 11-4 shows the operation of the A/D result

justification. The extra bits are loaded with 鈥?鈥檚. When

an A/D result will not overwrite these locations (A/D dis-

able), these registers may be used as two general

purpose 8-bit registers.

FIGURE 11-3:

A/D CONVERSION T

CYCLES

Conversion starts

9 T

10 T

to T

Holding Capacitor is disconnected from analog input (typically 100 ns)

Set GO bit

ADRES is loaded,

GO bit is cleared,

ADIF bit is set,

Holding Capacitor is connected to analog input

FIGURE 11-4:

A/D RESULT JUSTIFICATION

10-bit Result

ADFM =

0000 00

2107

0765

0000 00

ADRESH

ADRESL

10-bit Result

ADRESH

10-bit Result

ADRESL

Right Justified

Left Justified

DS39598D-page 86

Preliminary

铮?/div>

2003 Microchip Technology Inc.

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