HT46R0664 datasheet(57/92 Pages) HOLTEK

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Rev. 1.00

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HT46R0664

Enhanced A/D+LCD 8-Bit OTP MCU

A/D Converter Control Registers – ADCR, ACSR, ANCSR0, ANCSR1

To control the function and operation of the A/D converter, four control registers known as

ANCSR0, ANCSR1, ADCR and ACSR are provided. These 8-bit registers define functions such

as the selection of which analog channel is connected to the internal A/D converter, which pins are

used as analog inputs and which are used as normal I/Os, the A/D clock source as well as controlling

the start function and monitoring the A/D converter end of conversion status.

The ACS3~ACS0 bits in the ADCR register define the channel number. As the device contains only

one actual analog to digital converter circuit, each of the individual 12 analog inputs must be routed

to the converter. It is the function of the ACS3~ACS0 bits in the ADCR register to determine which

analog channel is actually connected to the internal A/D converter. The ANCSR0/ANCSR1 control

connected to external pin. If the 12-bit address on PCR11~PCR0 has a value of “FFFH”, then all

pins will all be set as analog inputs. Note that if the PCR11~PCR0 bits are all set to zero, then all the

pins will be setup as normal I/Os.

ANCSR0 Register

Bit

Name

PCR7

PCR6

PCR5

PCR4

PCR3

PCR�

PCR1

PCR0

R/W

POR

Bit 7~0

PCR[7:0]: define I/O lines or analog inputs configuration to port

0: digital I/O. Pin is assigned as an I/O line or pin-shared function

1: analog input. Pin is switched to analog input

ANCSR1 Register

Bit

Name

—

PCR11

PCR10

PCR9

PCR8

R/W

—

R/W

POR

—

Bit 7~4

Unused, read as “0”

Bit 3~0

PCR[11:8]: define I/O lines or analog inputs configuration to port

0: digital I/O. Pin is assigned as a I/O line or pin-shared function

1: analog input. Pin is switched to analog input

ADCR Register

Bit

Name

ST�RT

EOCB

—

�CS3

�CS�

�CS1

�CS0

R/W

—

R/W

POR

—

Bit 7

START: Start the A/D conversion

0→1→0: start

0→1: reset the A/D converter and set EOCB to “1”

This bit is used to initiate an A/D conversion process. The bit is normally low but if set

high and then cleared low again, the A/D converter will initiate a conversion process.

When the bit is set high the A/D converter will be reset.

Bit 6

EOCB: End of A/D conversion flag

0: A/D conversion ended

1: A/D conversion in progress

This read only flag is used to indicate when an A/D conversion process has completed.

When the conversion process is running the bit will be high.

HT46R0664 Datasheet(PDF) 57 Page - Holtek Semiconductor Inc

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