tmp19a44fda TOSHIBA Semiconductor CORPORATION, tmp19a44fda Datasheet - Page 474

• Manufacturer Part Number: tmp19a44fda
• Description: 32bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

(Note) "Please do not change the analog to digital conversion clock setting in the analog to digital
Analog/Digital Converter
ADACLK
(0xFF00_4D00)
17.2 Conversion Clock
Variable S/H time
fc
Example: If fsys = fc = 80 MHz
Prescaler [ADDCLK2:0]
1
1/2
1/4
fc=fsys →Conversion clock
fc=40MHz → ADCLK=40MHz
(Prescalar 1/1)
fc=80MHz → ADCLK=40MHz
(Prescalar 1/2)
The conversion time is calculated by the 46 conversion clock.
translation. "
bit
Symbol
Read/Writ
e
After
reset
Function
÷1
note1.Please change the setting from an initial value when 80MHz operates.
note2 ADCLK<2:0 > is not initialized in software reset.
÷2
Select the A/D sample hold time
1000: 8 conversion clock 1001:16 conversion clock
1010: 24 conversion clock 1011: 32 conversion clock
Other than above: reserved
0011: 64 conversion clock
1100: 128 conversion clock 1101: 512 conversion clock
TSH3
R/W
7
1
÷4
A/D Conversion Clock Setting Register
tconv. (conversion time)
40MHz
1.15μs
2.3μs
4.6μs
tSH2
R/W
6
0
S/H time
Conversion clk*8 (0.2us)
Conversion clk*16 (0.4us)
Conversion clk*24 (0.6us)
Conversion clk*32 (0.8us)
Conversion clk*64 (1.6us)
Conversion clk*128 (3.2us)
Conversion clk*512 (12.8us)
TMP19A44(rev1.3) 17-15
÷8
tSH1
÷16
R/W
5
0
ADDCLK2:0
tSH0
R/W
4
0
“0” is read.
tconv.
80MHz
Setting prohibited
1.15μs
2.3μs
R
3
0
tconv. (conversion time)
1.15μs
1.35μs
1.55μs
1.75μs
2.55μs
4.15μs
13.75μs
Select the A/D prescaler output
000: fc (note1)
001: fc/2
010: fc/4
011: fc/8
100: fc/16
111:reserved
ADCLK2
(conversion
R/W
ADCLK
2
0
TMP19A44
ADCLK1
R/W
0
1
time)
ADCLK0
2010-04-01
R/W
0
0