XC161CJ_02 Datasheet, PDF (62/78 Pages) Infineon Technologies AG – 16-Bi t Single-Chip Microcontroller Preliminary

XC161
Derivatives
Preliminary
Electrical Parameters
Sample time and conversion time of the XC161’s A/D Converter are programmable. In
compatibility mode, the above timing can be calculated using Table 14.
The limit values for f_BC must not be exceeded when selecting ADCTC.
Table 14 A/D Converter Computation Table¹⁾
ADCON.15|14 A/D Converter
(ADCTC)
Basic Clock f_BC
ADCON.13|12 Sample time
(ADSTC)
t_S
00
f_SYS / 4
00
t_BC × 8
01
f_SYS / 2
01
t_BC × 16
10
f_SYS / 16
10
t_BC × 32
11
f_SYS / 8
11
t_BC × 64
1) _{These selections are available in compatibility mode. An improved mechanism to control the ADC input clock}
can be selected.
Converter Timing Example:
Assumptions:
f_SYS
Basic clock
f_BC
Sample time
t_S
Conversion 8-bit t_C8
Conversion 10-bit t_C10
= 40 MHz (i.e. t_SYS = 25 ns), ADCTC = ‘01’, ADSTC = ‘00’.
= f_SYS / 2 = 20 MHz, i.e. t_BC = 50 ns.
= t_BC × 8 = 400 ns.
= t_S + 40 × t_BC + 2 × t_SYS = (400 + 2000 + 50) ns = 2.45 µs.
= t_S + 48 × t_BC + 2 × t_SYS = (400 + 2400 + 50) ns = 2.85 µs.
Data Sheet
58
V1.0, 2002-03