Dtc Source Address Register (Sar); Dtc Destination Address Register (Dar); Dtc Transfer Count Register A (Cra) - Renesas H8S/2319 series Hardware Manual

7.2.3

DTC Source Address Register (SAR)

Bit : 23
Initial value :
Unde-
fined
R/W : —
SAR is a 24-bit register that designates the source address of data to be transferred by the DTC.
For word-size transfer, specify an even source address.
7.2.4

DTC Destination Address Register (DAR)

Bit : 23
Initial value :
Unde-
fined
R/W : —
DAR is a 24-bit register that designates the destination address of data to be transferred by the
DTC. For word-size transfer, specify an even destination address.
7.2.5

DTC Transfer Count Register A (CRA)

Bit : 15
Initial value :
Unde-
fined
R/W : —
←– CRAH ––→ ← CRAL →
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 register functions as a 16-bit transfer counter (1 to 65,536). 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 register is divided into two parts: the upper 8 bits
(CRAH) and the lower 8 bits (CRAL). CRAH holds the number of transfers while CRAL
functions as an 8-bit transfer 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.
22 21 20 19
Unde- Unde- Unde- Unde-
fined fined fined fined
— — — —
22 21 20 19
Unde- Unde- Unde- Unde-
fined fined fined fined
— — — —
14 13 12 11
Unde- Unde- Unde- Unde- Unde-
fined fined fined fined
— — — —
– – –
– – –
– – –
– – –
– – –
– – –
– – –
– – –
10 9 8 7
Unde- Unde- Unde- Unde-
fined fined fined fined fined
— — — —
Rev. 5.00, 12/03, page 189 of 1088
4 3
Unde- Unde- Unde-
fined fined fined
— — —
4 3
Unde- Unde- Unde-
fined fined fined
— — —
6 5 4 3
Unde- Unde- Unde- Unde-
fined fined fined fined
— — — — —
2 1 0
Unde- Unde-
fined fined
— —
2 1 0
Unde- Unde-
fined fined
— —
2 1 0
Unde- Unde-
fined fined
— —