Analog-To-Digital Converter (Adc); Function Description; Control Register - IBM EM78M611E Specification

ERE [0~2] PWM Clock Prescaler
ERE [6, 7] PWM1/PWM2 Enable Bit
0 : Disable
1 : Enable

8.11 Analog-To-Digital Converter (ADC)

8.11.1 Function Description

The Analog to Digital converter consists of a 5-bit analog multiplexer, one Control
Register (ERA), and two data registers (RBS & RCS) for 10-bit resolution.
The ADC module utilizes successive approximation to convert the unknown analog
signal to a digital value. The result is fed to the ADDATA. Input channels are selected
by the analog input multiplexer via the ADCS/RAS bits AD0~AD4.
10-bit resolution: 0x00-00~0xC0-FF (0b11000000-11111111)
Start (0x00-00): 0 Vref~(1/1024) × Vref
Full (0xC0-FF): (1023/1024) × Vref~Vref
Conversion Time: 12 clock time of internal clock source

8.11.2 Control Register

ERA (AD Channel Select Register) Default Value: (0B_0001_1111)
Bit 7
ADC
Product Specification (V1.11) 04.20.2007
(This specification is subject to change without further notice)
PS2 PS1
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
Bit 6 Bit 5
0 0
Universal Serial Bus Series Microcontroller
PS0 Clock (Hz)
0
1
0 Fosc/12
1 Fosc/24
0 Fosc/48
1 Fosc/96
0 Fosc/192
1 Fosc/384
Bit 4 Bit 3
AD4 AD3
EM78M611E
Period/255 (s)
Fosc/3 0.5µ
Fosc/6 1µ
2µ
4µ
8µ
16µ
32µ
64µ
Bit 2 Bit 1 Bit 0
AD2 AD1 AD0
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