Chapter 14
DMA Controller
XIV - 12
DMA Data Transfer
14.3 DMA Data Transfer
There are two transfer modes, single transfer and burst transfer, which are selected with the DMCTR0H.DMTM.
14.3.1
Single Transfer Mode
When the DMA start trigger occurs, single data, the size of which is decided with DMCTR0H.DMUT, is trans-
ferred and the data transfer counter consisting of DMCNTH and DMCNTL are decremented by one. When all the
single data transfer finishes, DMA interrupt occurs.
If the DMA start trigger happens during the time after DMA reads the last single data from Source Address and
before the DMCTR1L.DMTEN is set to "1" by software (for example, the period (B) in the Figure:14.3.1), DMA-
AddReq interrupt occurs.
If the DMA start trigger happens during the time after the DMA start trigger occurs and before DMA reads the
data (not limited to the last single data) from Source Address (for example, the period (A) in the Figure:14.3.1),
DMA-Error interrupt occurs.
Figure:14.3.1 Example of Single Transfer
Read
Write
DMA
start trigger
DMA
interrupt
DMCNTH
DMCNTL
3
DMA
Memory Access
Read
Write
DMA
start trigger
Read
Write
DMA
start trigger
Period (A)
2
1
DMTEN of
DMCTR1L
When DMA interrupt occurs,
the DMTEN is cleard to "0" by hardware.
0
N
Set the DMTEN to "1"
by software for next DMA.
Period (B)
Period (A)
Period (A)
Содержание MN101L Series
Страница 1: ...Cover MICROCOMPUTER MN101L MN101LR05D 04D 03D 02D LSI User s Manual Pub No 21705 015E ...
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Страница 11: ...Contents Contents 0 ...
Страница 22: ... Contents 11 ...
Страница 23: ...I Chapter 1 Overview 1 ...
Страница 62: ...Chapter 1 Overview I 40 Cautions for Circuit Setup ...
Страница 63: ...II Chapter 2 CPU 2 ...
Страница 94: ...Chapter 2 CPU II 32 Reset ...
Страница 95: ...III Chapter 3 Interrupts 3 ...
Страница 143: ...IV Chapter 4 Clock Mode Voltage Control 4 ...
Страница 175: ...V Chapter 5 Watchdog Timer WDT 5 ...
Страница 180: ...Chapter 5 Watchdog Timer WDT V 6 Operation ...
Страница 181: ...VI Chapter 6 Power Supply Voltage Detection 6 ...
Страница 189: ...VII Chapter 7 I O Port 7 ...
Страница 248: ...Chapter 7 I O Port VII 60 Port 8 ...
Страница 249: ...VIII Chapter 8 8 bit Timer 8 ...
Страница 282: ...Chapter 8 8 bit Timer VIII 34 8 bit Timer Cascade Connection ...
Страница 283: ...IX Chapter 9 16 bit Timer 9 ...
Страница 346: ...Chapter 9 16 bit Timer IX 64 IGBT Output with Dead Time ...
Страница 347: ...X Chapter 10 General Purpose Time Base Free Running Timer 10 ...
Страница 361: ...XI Chapter 11 RTC Time Base Timer RTC TBT 11 ...
Страница 371: ...XII Chapter 12 Real Time Clock RTC 12 ...
Страница 389: ...XIII Chapter 13 Serial Interface 13 ...
Страница 458: ...Chapter 13 Serial Interface XIII 70 IIC Communication ...
Страница 459: ...XIV Chapter 14 DMA Controller 14 ...
Страница 472: ...Chapter 14 DMA Controller XIV 14 DMA Data Transfer ...
Страница 473: ...XV Chapter 15 Buzzer 15 ...
Страница 479: ...XVI Chapter 16 A D Converter ADC 16 ...
Страница 493: ...XVII Chapter 17 LCD 17 ...
Страница 530: ...Chapter 17 LCD XVII 38 LCD Display Examples ...
Страница 531: ...XVIII Chapter 18 ReRAM 18 ...
Страница 538: ...Chapter 18 ReRAM XVIII 8 Command Library ...
Страница 539: ...XIX Chapter 19 On Board Debugger 19 ...
Страница 542: ...Chapter 19 On Board Debugger XIX 4 List of on board debugging functions ...
Страница 543: ...XX Chapter 20 Appendix 20 ...
Страница 555: ...Chapter 20 Appendix Instruction map XX 13 ...