HD6412350 Hitachi, HD6412350 Datasheet - Page 232

• Manufacturer Part Number: HD6412350
• Description: (HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
• Manufacturer: Hitachi

7.3.3
ETCR is a 16-bit readable/writable register that specifies the number of transfers. The function of
this register is different in normal mode and in block transfer mode.
ETCR is not initialized by a reset or in standby mode.
(1) Normal Mode
ETCRA
In normal mode, ETCRA functions as a 16-bit transfer counter. ETCRA is decremented by 1 each
time a transfer is performed, and transfer ends when the count reaches H'0000. ETCRB is not used
at this time.
ETCRB
ETCRB is not used in normal mode.
(2) Block Transfer Mode
ETCRA
212
Holds block size
Bit
ETCRAH
Initial value
R/W
Block size counter
Bit
ETCRAL
Initial value
R/W
Transfer Counter
Bit
ETCR
Initial value
R/W
Execute Transfer Count Register (ETCR)
:
:
:
:
:
:
:
:
:
:
:
:
R/W
15
*
R/W
R/W
15
7
*
*
R/W
14
*
R/W
13
*
R/W
R/W
14
6
*
*
R/W
12
*
R/W
11
*
R/W
R/W
13
5
*
*
R/W
10
*
R/W
9
*
R/W
R/W
12
4
*
*
R/W
8
*
R/W
7
*
R/W
R/W
11
3
*
*
R/W
6
*
R/W
5
*
R/W
R/W
10
*
2
*
R/W
4
*
R/W
3
*
R/W
R/W
9
1
*
*
R/W
2
*
*: Undefined
*: Undefined
R/W
1
*
R/W
R/W
8
0
*
*
R/W
0
*