DF61654N50FTV Renesas Electronics America, DF61654N50FTV Datasheet - Page 341

• Manufacturer Part Number: DF61654N50FTV
• Description: IC H8SX/1654 MCU FLASH 120TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8SX/1600r

Specifications of DF61654N50FTV

• Core Processor: H8SX
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: I²C, IrDA, SCI, SmartCard, USB
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 75
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 40K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 120-TQFP, 120-VQFP
• For Use With: HS0005KCU11H - EMULATOR E10A-USB H8S(X),SH2(A)3DK1657 - DEV EVAL KIT FOR H8SX/1657
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

(6)
When the NRD bit in DMDR is set to 1, the timing of receiving the next transfer request is
delayed for one cycle.
Figure 7.33 shows an example of normal transfer mode activated by the DREQ signal low level
with NRD = 1.
The DREQ signal is sampled every cycle from the next rising edge of the Bφ signal immediately
after the DTE bit write cycle.
When a low level of the DREQ signal is detected while a transfer request by the DREQ signal is
enabled, a transfer request is held in the DMAC. When the DMAC is activated, the transfer
request is cleared. Receiving the next transfer request resumes after completion of the write cycle
and then a low level of the DREQ signal is detected. This operation is repeated until the transfer is
completed.
B
DREQ
Address bus
Channel
[1]
[2][5] The DMAC is activated and the transfer request is cleared.
[3][6] A DMA cycle is started.
[4][7] Transfer request enable is resumed one cycle after completion of the write cycle.
Activation Timing by DREQ Low Level with NRD = 1
After DMA transfer request is enabled, a low level of the DREQ signal is detected at the rising edge of the B signal and a transfer
request is held.
(A low level of the DREQ signal is detected at the rising edge of the B signal and a transfer request is held. This is the same as [1].)
Figure 7.33 Example of Transfer in Normal Transfer Mode Activated
[1]
Request
Bus released
Min. of 3 cycles
[2]
Duration of transfer
[3]
request disabled
DMA read
by DREQ Low Level with NRD = 1
cycle
Transfer
source
DMA read
destination
Transfer
cycle
Duration of transfer request
disabled which is extended
Transfer request enable resumed
by NRD
Bus released
[4]
Request
Min. of 3 cycles
[5]
Rev.1.00 Sep. 08, 2005 Page 291 of 966
[6]
Duration of transfer
request disabled
Section 7 DMA Controller (DMAC)
DMA read
Transfer
cycle
source
Transfer request enable resumed
DMA read
destination
cycle
Transfer
Duration of transfer request
disabled which is extended
REJ09B0219-0100
by NRD
Bus released
[7]