M306N4FGTFP Renesas Electronics America, M306N4FGTFP Datasheet - Page 375

• Manufacturer Part Number: M306N4FGTFP
• Description: IC M16C MCU FLASH 100QFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/6Nr

Specifications of M306N4FGTFP

• Core Processor: M16C/60
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: CAN, I²C, IEBus, SIO, UART/USART
• Peripherals: DMA, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 10K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 26x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

M16C/6N Group (M16C/6N4)
Rev.2.40
REJ09B0009-0240
23.7 DMAC
23.7.1 Write to DMAE Bit in DMiCON Register (i = 0, 1)
When both of the conditions below are met, follow the steps below.
Conditions
• The DMAE bit is set to 1 again while it remains set (DMAi is in an active state).
• A DMA request may occur simultaneously when the DMAE bit is being written.
Step 1: Write 1 to the DMAE bit and DMAS bit in the DMiCON register simultaneously
Step 2: Make sure that the DMAi is in an initial state
If the DMAi is not in an initial state, the above steps should be repeated.
NOTES:
1. The DMAS bit remains unchanged even if 1 is written. However, if 0 is written to this bit, it is set to 0
2. Read the TCRi register to verify whether the DMAi is in an initial state. If the read value is equal to
Apr 14, 2006
(DMA not requested). In order to prevent the DMAS bit from being modified to 0, 1 should be written
to the DMAS bit when 1 is written to the DMAE bit. In this way the state of the DMAS bit immediately
before being written can be maintained.
Similarly, when writing to the DMAE bit with a read-modify-write instruction, 1 should be written to
the DMAS bit in order to maintain a DMA request which is generated while the instruction is being
executing.
a value which was written to the TCRi register before DMA transfer start, the DMAi is in an initial
state. (If a DMA request occurs after writing to the DMAE bit, the value written to the TCRi register
is 1.) If the read value is a value in the middle of transfer, the DMAi is not in an initial state.
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(2)
in a program.
(1)
.
23. Usage Notes