Rainbow Electronics ATmega64M1 - Manual (Page 250)

250
8209A–AVR–08/09
ATmega16M1/32M1/64M1
22.10.9 AMP1CSR – Amplifier 1 Control and Status register
• Bit 7 – AMP1EN: Amplifier 1 Enable Bit
Set this bit to enable the Amplifier 1.
Clear this bit to disable the Amplifier 1.
Clearing this bit while a conversion is running will take effect at the end of the conversion.
Warning: Always clear AMP1TS0:1 when clearing AMP1EN.
• Bit 6 – AMP1IS: Amplifier 1 Input Shunt
Set this bit to short-circuit the Amplifier 1 input.
Clear this bit to normally use the Amplifier 1.
• Bit 5:4 – AMP1G[1:0]: Amplifier 1 Gain Selection Bits
These 2 bits determine the gain of the amplifier 1.
The different setting are shown in
Table 22-10 .
To ensure an accurate result, after the gain value has been changed, the amplifier input needs
to have a quite stable input value during at least 4 Amplifier synchronization clock periods.
Table 22-9. AMP0 Clock Source Selection
AMP0TS[2:0] Clock Source
000 ADC Clock/8
001 Timer/Counter0 Compare Match
010 Timer/Counter0 Overflow
011 Timer/Counter1 Compare Match B
100 Timer/Counter1 Overflow
101 PSC Module 0 Synchronization Signal (PSS0)
110 PSC Module 1 Synchronization Signal (PSS1)
111 PSC Module 2 Synchronization Signal (PSS2)
Bit 7 6 5 4 3 2 1 0
AMP1EN AMP1IS AMP1G1 AMP1G0 AMPCMP1 AMP1TS2 AMP1TS1 AMP1TS0 AMP1CSR
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0
Table 22-10. Amplifier 1 Gain Selection
AMP1G[1:0] Description
00 Gain 5
01 Gain 10
10 Gain 20
11 Gain 40