DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 216

• Manufacturer Part Number: DF2211NP24V
• Description: H8S/2200 Series, 2212 Group, USB, RTC, HSS TNP-64B; Vcc= 2.7 to 3.6 volts, Temp= -20 to 75 C; Package: PVQN0064LB-A
• Manufacturer: Renesas Technology / Hitachi Semiconductor

7.3.3
• Short Address Mode
• Full Address Mode
Rev.7.00 Dec. 24, 2008 Page 162 of 698
REJ09B0074-0700
ETCR is a 16-bit readable/writable register that specifies the number of transfers. The setting
of this register is different for sequential mode and idle mode on the one hand, and for repeat
mode on the other. ETCR is not initialized by a reset or in standby mode.
⎯ Sequential Mode and Idle Mode
⎯ Repeat Mode
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.
⎯ Normal Mode
⎯ Block Transfer Mode
In sequential mode and idle mode, ETCR functions as a 16-bit transfer counter (with a
count range of 1 to 65,536). ETCR is decremented by 1 each time a transfer is performed,
and when the count reaches H'0000, the DTE bit in DMABCR is cleared, and transfer ends.
In repeat mode, ETCR functions as an 8-bit transfer counter ETCRL (with a count range of
1 to 256) and transfer number storage register ETCRH. ETCRL is decremented by 1 each
time a transfer is performed, and when the count reaches H'00, ETCRL is loaded with the
value in ETCRH. At this point, MAR is automatically restored to the value it had when the
count was started. The DTE bit in DMABCR is not cleared, and so transfers can be
performed repeatedly until the DTE bit is cleared by the user.
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.
(b) ETCRB
ETCRB is not used in normal mode.
In block transfer mode, ETCRAL functions as an 8-bit block size counter and ETCRAH
holds the block size. ETCRAL is decremented each time a 1-byte or 1-word transfer is
performed, and when the count reaches H'00, ETCRAL is loaded with the value in
ETCRAH. So by setting the block size in ETCRAH and ETCRAL, it is possible to
repeatedly transfer blocks consisting of any desired number of bytes or words.
(b) ETCRB
ETCRB functions in block transfer mode, as a 16-bit block transfer counter. ETCRB is
decremented by 1 each time a block is transferred, and transfer ends when the count reaches
H'0000.
(a) ETCRA
(a) ETCRA
Execute Transfer Count Register (ETCR)