Bit Ad Converter (Adc); Configuration - Philips CEM2100/00 Service Manual

17. 10-bit AD Converter (ADC)

The T5CL8 have a 10-bit successive approximation type AD converter.

17.1 Configuration

The circuit configuration of the 10-bit AD converter is shown in Figure 17-1.
It consists of control register ADCCR1 and ADCCR2, converted value register ADCDR1 and ADCDR2, a DA
converter, a sample-hold circuit, a comparator, and a successive comparison circuit.
VAREF
AVDD
Analog input
multiplexer
AIN0
A
n
AIN15
S EN
4
SAIN
Note: Before using AD converter, set appropriate value to I/O port register conbining a analog input port. For details, see the sec-
tion on "I/O ports".
R/2 R
Sample hold
circuit
Y
Control circuit
AINDS
2
AMD
ADCCR1
AD converter control register 1, 2
Figure 17-1 10-bit AD Converter
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DA converter
R/2
Reference
voltage
10
Analog
comparator
Successive approximate circuit
Shift clock
8
3
ACK
ADCCR2 ADCDR1
AD conversion result register 1, 2
T5CL8
VSS
INTADC
ADBF
2 EOCF
ADCDR2