H8S2245 datasheet(226/818 Pages) RENESAS

226 / 818 page

Section 7 Data Transfer Controller

Rev.3.00 Mar. 26, 2007 Page 184 of 772

REJ09B0355-0300

7.2.5

DTC Transfer Count Register A (CRA)

76543210

CRAH

CRAL

Bit

Initial value

—

Unde-

fined

R/W

—

Unde-

fined

—

Unde-

fined

—

Unde-

fined

—

Unde-

fined

—

Unde-

fined

—

Unde-

fined

—

Unde-

fined

—

Unde-

fined

—

Unde-

fined

—

Unde-

fined

—

Unde-

fined

—

Unde-

fined

—

Unde-

fined

—

Unde-

fined

—

Unde-

fined

CRA is a 16-bit register that designates the number of times data is to be transferred by the DTC.

In normal mode, the entire CRA functions as a 16-bit transfer counter (1 to 65536). It is

decremented by 1 every time data is transferred, and transfer ends when the count reaches H'0000.

In repeat mode or block transfer mode, the CRA is divided into two parts: the upper 8 bits

(CRAH) and the lower 8 bits (CRAL). In repeat mode, CRAH holds the number of transfers while

CRAL functions as an 8-bit transfer counter (1 to 256). In block transfer mode, CRAH holds the

block size while CRAL functions as an 8-bit block size counter (1 to 256). CRAL is decremented

by 1 every time data is transferred, and the contents of CRAH are sent when the count reaches

H'00. This operation is repeated.

7.2.6

DTC Transfer Count Register B (CRB)

76543210

Bit

Initial value

—

——

—

——

—

——

—

Unde-

fined

Unde-

fined

Unde-

fined

Unde-

fined

Unde-

fined

Unde-

fined

Unde-

fined

Unde-

fined

Unde-

fined

Unde-

fined

Unde-

fined

Unde-

fined

Unde-

fined

Unde-

fined

Unde-

fined

Unde-

fined

R/W

CRB is a 16-bit register that designates the number of times data is to be transferred by the DTC in

block transfer mode. It functions as a 16-bit transfer counter (1 to 65536) that is decremented by 1

every time data is transferred, and transfer ends when the count reaches H'0000.

H8S2245 датащи(PDF) 226 Page - Renesas Technology Corp

H8S2245 датащи(HTML) 226 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

датащи скачать

ссылки URL