R5F61668RN50FPV Renesas Electronics America, R5F61668RN50FPV Datasheet - Page 475

• Manufacturer Part Number: R5F61668RN50FPV
• Description: IC H8SX/1668 MCU FLASH 144LQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8SX/1600r

Specifications of R5F61668RN50FPV

• Core Processor: H8SX
• Core Size: 16/32-Bit
• Speed: 50MHz
• Connectivity: EBI/EMI, I²C, IrDA, SCI, SmartCard, USB
• Peripherals: DMA, LVD, POR, PWM, WDT
• Number Of I /o: 92
• Program Memory Size: 1MB (1M x 8)
• Program Memory Type: FLASH
• Ram Size: 56K 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: 144-LQFP
• For Use With: R0K561668S000BE - KIT STARTER FOR H8SX/1668R0K561664S001BE - KIT STARTER FOR H8SX/1651HS0005KCU11H - EMULATOR E10A-USB H8S(X),SH2(A)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

(3)
Figure 10.36 shows an example of single address mode activated by the DREQ signal falling edge.
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 and starts detecting a high level of the DREQ signal for falling edge detection. If
a high level of the DREQ signal has been detected until completion of the single cycle, receiving
the next transfer request resumes and then a low level of the DREQ signal is detected. This
operation is repeated until the transfer is completed.
[1]
[2][5] The DMAC is activated and the transfer request is cleared.
[3][6] A DMA cycle is started and sampling the DREQ signal at the rising edge of the Bφ signal is started to detect a high level of the
[4][7] When a high level of the DREQ signal has been detected, transfer enable is resumed after completion of the write cycle.
Activation Timing by DREQ Falling Edge
After DMA transfer request is enabled, a low level of the DREQ signal is detected at the rising edge of the Bφ signal and a transfer
request is held.
DREQ signal.
(A low level of the DREQ signal is detected at the rising edge of the Bφ signal and a transfer request is held. This is the same as [1].)
Bφ
DREQ
Address bus
DACK
DMA
operation
Channel
Figure 10.36 Example of Transfer in Single Address Mode Activated
Wait
[1]
Request
Min. of 3 cycles
released
Bus
[2]
Duration of transfer
request disabled
by DREQ Falling Edge
Single
[3]
Transfer destination
Transfer source/
DMA single
cycle
Wait
Transfer request
enable resumed
[4]
Request
Min. of 3 cycles
[5]
released
Bus
Rev. 2.00 Sep. 24, 2008 Page 441 of 1468
Duration of transfer
request disabled
Section 10 DMA Controller (DMAC)
Single
[6]
Transfer destination
Transfer source/
DMA single
cycle
Wait
Transfer request
enable resumed
[7]
released
Bus
REJ09B0412-0200