Section 5 Interrupt Controller
Rev. 1.00 Mar. 12, 2008 Page 100 of 1178
REJ09B0403-0100
5.6.5
DTC Activation by Interrupt
The DTC can be activated by an interrupt. In this case, the following options are available:
•
Interrupt request to CPU
•
Activation request to DTC
•
Both of the above
For details of interrupt requests that can be used to activate the DTC, see section 7, Data Transfer
Controller (DTC). Figure 5.8 shows a block diagram of the DTC and interrupt controller.
Selection
circuit
DTCER
DTVECR
Control logic
Determination of
priority
CPU
DTC
DTC activation
request vector
number
Clear signal
CPU interrupt
request vector
number
Select
signal
Interrupt
request
Interrupt source
clear signal
IRQ
interrupt
On-chip
peripheral
module
Clear signal
Interrupt controller
I, UI
SWDTE
clear signal
Figure 5.8 Interrupt Control for DTC
The interrupt controller has three main functions in DTC control.
(1) Selection of Interrupt Source
It is possible to select DTC activation request or CPU interrupt request with the DTCE bit of
DTCERA to DTCERF in the DTC. After a DTC data transfer, the DTCE bit can be cleared to 0
and an interrupt request sent to the CPU in accordance with the specification of the DISEL bit of
MRB in the DTC. When the DTC performs the specified number of data transfers and the transfer
counter reaches 0, following the DTC data transfer the DTCE bit is cleared to 0 and an interrupt
request is sent to the CPU.
Summary of Contents for H8S Family
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Page 70: ...Section 1 Overview Rev 1 00 Mar 12 2008 Page 22 of 1178 REJ09B0403 0100...
Page 108: ...Section 2 CPU Rev 1 00 Mar 12 2008 Page 60 of 1178 REJ09B0403 0100...
Page 116: ...Section 3 MCU Operating Modes Rev 1 00 Mar 12 2008 Page 68 of 1178 REJ09B0403 0100...
Page 152: ...Section 5 Interrupt Controller Rev 1 00 Mar 12 2008 Page 104 of 1178 REJ09B0403 0100...
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Page 420: ...Section 9 14 Bit PWM Timer PWMX Rev 1 00 Mar 12 2008 Page 372 of 1178 REJ09B0403 0100...
Page 476: ...Section 12 Watchdog Timer WDT Rev 1 00 Mar 12 2008 Page 428 of 1178 REJ09B0403 0100...
Page 552: ...Section 14 CRC Operation Circuit CRC Rev 1 00 Mar 12 2008 Page 504 of 1178 REJ09B0403 0100...
Page 712: ...Section 18 I2 C Bus Interface IIC Rev 1 00 Mar 12 2008 Page 664 of 1178 REJ09B0403 0100...
Page 804: ...Section 19 LPC Interface LPC Rev 1 00 Mar 12 2008 Page 756 of 1178 REJ09B0403 0100...
Page 838: ...Section 20 Ethernet Controller EtherC Rev 1 00 Mar 12 2008 Page 790 of 1178 REJ09B0403 0100...
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Page 1066: ...Section 25 Flash Memory Rev 1 00 Mar 12 2008 Page 1018 of 1178 REJ09B0403 0100...
Page 1098: ...Section 26 Boundary Scan JTAG Rev 1 00 Mar 12 2008 Page 1050 of 1178 REJ09B0403 0100...
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