M306V2 Mitsubishi, M306V2 Datasheet - Page 70

• Manufacturer Part Number: M306V2
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
• Manufacturer: Mitsubishi

70
Table 2.9.1 DMAC specifications
Note: DMA transfer is not effective to any interrupt. DMA transfer is affected neither by the interrupt enable
No. of channels
Transfer memory space
Maximum No. of bytes transferred
DMA request factors (Note)
Channel priority
Transfer unit
Transfer address direction
Transfer mode
DMA interrupt request generation timing When an underflow occurs in the transfer counter
Active
Forward address pointer and
reload timing for transfer counter
Writing to register
Reading the register
Inactive
flag (I flag) nor by the interrupt priority level.
Item
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
2 (cycle steal method)
• From any address in the 1M bytes space to a fixed address
• From a fixed address to any address in the 1M bytes space
• From a fixed address to a fixed address
128K bytes (with 16-bit transfers) or 64K bytes (with 8-bit transfers)
Falling edge or both edge of pin INT
Falling edge of pin INT
Timer A0 to timer A4 interrupt requests
Timer B0 to timer B2 interrupt requests
UART0 transmission and reception interrupt requests
UART2 transmission and reception interrupt requests
Multi-master I
Multi-master I
A-D conversion interrupt request
OSD1 and OSD2 interrupt requests
Data slicer interrupt request
V
Software triggers
DMA0 takes precedence if DMA0 and DMA1 requests are generated simultaneously
8 bits or 16 bits
forward/fixed (forward direction cannot be specified for both source and
destination simultaneously)
• Single transfer
• Repeat transfer mode
When the DMA enable bit is set to “1”, the DMAC is active.
When the DMAC is active, data transfer starts every time a DMA transfer request
signal occurs.
• When the DMA enable bit is set to “0”, the DMAC is inactive.
• After the transfer counter underflows in single transfer mode
the value of one of source pointer and destination pointer - the one specified for
the forward direction - is reloaded to the forward direction address pointer, and
the value of the transfer counter reload register is reloaded to the transfer counter.
Registers specified for forward direction transfer are always write enabled.
Registers specified for fixed address transfer are write-enabled when the DMA enable bit is “0”.
Can be read at any time.
However, when the DMA enable bit is “1”, reading the register set up as the
forward register is the same as reading the value of the forward address pointer.
At the time of starting data transfer immediately after turning the DMAC active,
(Note that DMA-related registers [0020
SYNC
After the transfer counter underflows, the DMA enable bit turns to “0”, and the
DMAC turns inactive
After the transfer counter underflows, the value of the transfer counter reload
register is reloaded to the transfer counter.
The DMAC remains active unless a “0” is written to the DMA enable bit.
interrupt request
2
2
C-BUS interface 0 interrupt request
C-BUS interface 1 interrupt request
mode
_______
1
Specification
________
0
and ON-SCREEN DISPLAY CONTROLLER
16
to 003F
MITSUBISHI MICROCOMPUTERS
M306V2ME-XXXFP
16
] cannot be accessed)
M306V2EEFP
Rev. 1.0