參數(shù)資料
型號： ST90158M9T1
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 14 MHz, MICROCONTROLLER, PQFP80
封裝： PLASTIC, TQFP-80
文件頁數(shù)： 155/190頁
文件大小： 1152K
代理商： ST90158M9T1
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ST90158 - ON-CHIP DIRECT MEMORY ACCESS (DMA)
5.6 DMA REGISTERS
As each peripheral DMA channel has its own spe-
cific control registers, the following register list
should be considered as a general example. The
names and register bit allocations shown here
may be different from those found in the peripheral
chapters.
DMA COUNTER POINTER REGISTER (DCPR)
Read/Write
Address set by Peripheral
Reset value: undefined
Bit 7:1 = C[7:1]:
DMA Transaction Counter Point-
er.
Software should write the pointer to the DMA
Transaction Counter in these bits.
Bit 0 = RM:
Register File/Memory Selector.
This bit is set and cleared by software.
0: DMA transactions are with memory (see also
DAPR.DP)
1: DMA transactions are with the Register File
GENERIC EXTERNAL PERIPHERAL INTER-
RUPT AND DMA CONTROL (IDCR)
Read/Write
Address set by Peripheral
Reset value: undefined
Bit 5 = IP:
Interrupt Pending.
This bit is set by hardware when the Trigger Event
occurs. It is cleared by hardware when the request
is acknowledged. It can be set/cleared by software
in order to generate/cancel a pending request.
0: No interrupt pending
1: Interrupt pending
Bit 4 = DM:
DMA Request Mask.
This bit is set and cleared by software. It is also
cleared when the transaction counter reaches
zero (unless SWAP mode is active).
0: No DMA request is generated when IP is set.
1: DMA request is generated when IP is set
Bit 3 = IM:
End of block Interrupt Mask.
This bit is set and cleared by software.
0: No End of block interrupt request is generated
when IP is set
1: End of Block interrupt is generated when IP is
set. DMA requests depend on the DM bit value
as shown in the table below.
Bit 2:0 = PRL[2:0]:
Source Priority Level.
These bits are set and cleared by software. Refer
to Section 5.2 DMA PRIORITY LEVELS for a de-
scription of priority levels.
DMA ADDRESS POINTER REGISTER (DAPR)
Read/Write
Address set by Peripheral
Reset value: undefined
Bit 7:1 = A[7:1]:
DMA Address Register(s) Pointer
Software should write the pointer to the DMA Ad-
dress Register(s) in these bits.
Bit 0 = PS:
Memory Segment Pointer Selector:
This bit is set and cleared by software. It is only
meaningful if DAPR.RM=0.
0: The ISR register is used to extend the address
of data transferred by DMA (see MMU chapter).
1: The DMASR register is used to extend the ad-
dress of data transferred by DMA (see MMU
chapter).
70
C7
C6
C5
C4
C3
C2
C1
RM
70
IP
DM
IM
PRL2 PRL1 PRL0
DM IM Meaning
10
A DMA request generated without End of Block
interrupt when IP=1
11
A DMA request generated with End of Block in-
terrupt when IP=1
00
No End of block interrupt or DMA request is
generated when IP=1
01
An End of block Interrupt is generated without
associated DMA request (not used)
PRL2 PRL1 PRL0 Source Priority Level
0000 Highest
0011
0102
0113
1004
1015
1106
1117 Lowest
70
A7
A6
A5
A4
A3
A2
A1
PS
9
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