7733 datasheet(270/940 Pages) RENESAS

270 / 940 page

A-D CONVERTER

7733 Group User’s Manual

9–5

f2 divided by 4

15.68

18.88

A-D conversion frequency (

φAD) selection flag

φAD

Conversion time

Resolution : 8 bits

•System clock = 25 MHz (Note)

Resolution : 10 bits

f2 divided by 2

7.84

9.44

(2) Trigger selection bit (bit 5)

This bit selects a trigger occurrence source. (Refer to “(3) A-D conversion start flag.”)

(3) A-D conversion start flag (bit 6)

When internal trigger is selected

When this bit is set to “1,” a trigger occurs, and then the A-D converter starts operating. When this

bit is cleared to “0,” the A-D converter stops operating.

In the one-shot or single sweep mode, this bit is cleared to “0” after A-D conversion is completed.

In the repeat or repeat sweep mode, the A-D converter continues operating until this bit is cleared

to “0” by software.

When external trigger is selected

______

If the ADTRG pin level goes from “H” to “L” when this bit = “1,” a trigger occurs, and then the A-D

converter starts operating. The A-D converter stops operating when this bit is cleared to “0.” In the

one-shot or single sweep mode, this bit remains set to “1” even after A-D conversion is completed.

In the repeat or repeat sweep mode, the A-D converter continues operating until this bit is cleared

to “0” by software.

(4) A-D conversion frequency (

φAD) selection flag (bit 7)

Conversion time varies according to the A-D converter’s operating clock (

φAD) selected by this bit as

listed in Table 9.2.1. Since the A-D converter’s comparator consists of capacity coupling amplifiers,

keep that

φAD ≥ 250 kHz during A-D conversion.

Note: This is applied when the following conditions are satisfied;

•f(XIN) = 25 MHz

•The main clock is selected as the system clock.

•Main clock divided by 2 is available.

Table 9.2.1 Conversion time per one analog input pin (Unit:

µs)

9.2 Block description

7733 Datasheet(PDF) 270 Page - Renesas Technology Corp

7733 Datasheet(HTML) 270 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL