User’s Manual U12688EJ4V0UM00
161
CHAPTER 6 DMA FUNCTIONS (DMA CONTROLLER)
The V850E/MS1 includes a DMA (Direct Memory Access) controller (DMAC), which executes and controls DMA
transfer.
The DMAC (DMA controller) transfers data between memory and I/O, or within memory, based on DMA requests
issued by the internal peripheral I/O (serial interface and real-time pulse unit), DMARQ0 to DMARQ3 pins, or
software triggers.
6.1
Features
{
4 independent DMA channels
{
Transfer unit: 8/16 bits
{
Maximum transfer count: 65,536 (2
16
)
{
Two types of transfer
•
Flyby (one-cycle) transfer
•
Two-cycle transfer
{
Three transfer modes
•
Single transfer mode
•
Single-step transfer mode
•
Block transfer mode
{
Transfer requests
•
DMARQ0 to DMARQ3 pin (
×
4)
•
Requests from internal peripheral I/O (serial interface and real-time pulse unit)
•
Requests from software
{
Transfer objects
•
Memory to I/O and vice versa
•
Memory to memory
{
DMA transfer end output signal (TC0 to TC3)
Содержание V850E/MS1 UPD703100
Страница 2: ...User s Manual U12688EJ4V0UM00 2 MEMO ...
Страница 6: ...User s Manual U12688EJ4V0UM00 6 MEMO ...
Страница 8: ...User s Manual U12688EJ4V0UM00 8 MEMO ...
Страница 12: ...User s Manual U12688EJ4V0UM00 12 MEMO ...
Страница 26: ...User s Manual U12688EJ4V0UM00 26 MEMO ...
Страница 68: ...User s Manual U12688EJ4V0UM00 68 MEMO ...
Страница 124: ...User s Manual U12688EJ4V0UM00 124 MEMO ...
Страница 198: ...User s Manual U12688EJ4V0UM00 198 MEMO ...
Страница 230: ...User s Manual U12688EJ4V0UM00 230 MEMO ...
Страница 422: ...User s Manual U12688EJ4V0UM00 422 MEMO ...