TMP92CZ26A

92CZ26A-605

AD Conversion Clock Setting Register
7 6 5 4 3 2 1 0
bit Symbol
ADCLK2 ADCLK1 ADCLK0
Read/Write R/W R/W R/W R/W
After reset 0 0 0 0
Function
Always
write “0” Select clock for AD conversion
000 : Reserved 100 : fIO/4
001 : fIO/1 101 : fIO/5
010 : fIO/2 110 : fIO/6
011 : fIO/3 111 : fIO/7
Note1: AD conversion is executed at the clock frequ ency selected in the above register. To as sure
conversion accuracy, however, the conversion clock frequency must not exceed 12MHz
MHz.
Note2: Don ‘t change the clock frequency while AD conversion is in progress.
Figure 3.23.11 AD Conversion Registers
fIO(fSYS/2) <ADCLK2:0> ADCLK
AD conversion
speed
100(fIO/4) 10.0MHZ 12 μsec
40MHz 101(fIO/5) 8MHZ 15 μsec
011(fIO/3) 10.0MHZ 12 μsec
30MHz 100(fIO/4) 7.5MHZ 16 μsec
AD conversion speed can be calc ulated by foll owing.
Conversion speed = 120 × (1/ADCLK)
÷1 ÷7
fSYS
<ADCLK2:0>
ADCLK
A
DCCLK
(12BFH)