HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 248

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 7 Data Transfer Controller
7.4
An interrupt request is issued to the CPU when the DTC finishes the specified number of data
transfers, or a data transfer for which the DISEL bit was set to 1. In the case of interrupt activation,
the interrupt set as the activation source is generated. These interrupts to the CPU are subject to
CPU mask level and interrupt controller priority level control.
In the case of activation by software, a software activated data transfer end interrupt (SWDTE
ND) is generated.
When one data transfer ends, or the specified number of data transfers end, with the DISEL bit set
to 1, after the end of the data transfer the SWDTE bit remains set to 1 and an SWDTEND interrupt
is generated.
The interrupt handling routine should clear the SWDTE bit to 0.
When the DTC is activated by software, an SWDTEND interrupt is not generated during a data
transfer wait or during data transfer even if the SWDTE bit is set to 1.
7.5
Module Stop: When the MSTP14 bit in MSTPCR is set to 1, the DTC clock stops, and the DTC
enters the module stop state. However, 1 cannot be written in the MSTP14 bit while the DTC is
operating. See section 18, Power-Down Modes, for details.
On-Chip RAM: The MRA, MRB, SAR, DAR, CRA, and CRB registers are all located in on-chip
RAM. When the DTC is used, the RAME bit in SYSCR must not be cleared to 0.
DTCE Bit Setting: For DTCE bit setting, use bit manipulation instructions such as BSET and
BCLR. If all interrupts are masked, multiple activation sources can be set at one time by writing
data after executing a dummy read on the relevant register.
Rev.3.00 Mar. 26, 2007 Page 206 of 772
REJ09B0355-0300
Interrupts
Usage Notes