HD64570F16 Renesas Electronics America, HD64570F16 Datasheet - Page 276

• Manufacturer Part Number: HD64570F16
• Description: IC SCA SRL COMM ADAPTER 88QFP
• Manufacturer: Renesas Electronics America

Specifications of HD64570F16

• Applications: ISDN
• Interface: Serial
• Voltage - Supply: 4.75 V ~ 5.25 V
• Package / Case: 88-QFP
• Mounting Type: Surface Mount
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temp Range: -20C to 75C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

6.2.13
The DMA master enable register (DMER), shared by channels 0, 1, 2, and 3, enables or disables
DMA master operation. This register can be accessed only in byte units.
Bit 7 (DME: DMA Master Enable): Enables or disables channels 0, 1, 2, or 3 in either single-
block transfer mode or chained-block transfer mode as follows.
DME = 0: Disables all channels
DME = 1: Enables channel(s) depending on the DE bit of the DMA status register (DSR) of each
After reset, the value of the DME bit is 1.
Bits 6–0: Reserved. These bits always read 0 and must be set to 0.
Rev. 0, 07/98, page 260 of 453
DMA Master Enable Register (DMER)
Note: Bits 6–0 are reserved. These bits always read 0 and must be set to 0.
Single-block
transfer mode
Chained-block
transfer mode
Read/Write
Initial value
channel
DMA master enable
0:
1:
Disable
Enable
DME
R/W
7
1
—
—
6
0
—
5
—
0
—
—
4
0
—
—
3
0
—
—
2
0
—
—
1
0
—
—
0
0