UPD78F1233GB-GAH-AX Renesas Electronics America, UPD78F1233GB-GAH-AX Datasheet - Page 863

• Manufacturer Part Number: UPD78F1233GB-GAH-AX
• Description: MCU 16BIT 78K0R/LX3 64-LQFP
• Manufacturer: Renesas Electronics America
• Series: 78K0R/Ix3r

Specifications of UPD78F1233GB-GAH-AX

• Core Processor: 78K/0R
• Core Size: 16-Bit
• Speed: 40MHz
• Connectivity: 3-Wire SIO, I²C, LIN, UART/USART
• Peripherals: DMA, LVD, POR, PWM, WDT
• Number Of I /o: 50
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

16.5.4 Holding DMA transfer pending by DWAITn
the CPU is stopped and delayed for the duration of 2 clocks. If this poses a problem to the operation of the set
system, a DMA transfer can be held pending by setting DWAITn to 1.
width increases to 12 if a DMA transfer is started midway. In this case, the DMA transfer can be held pending by
setting DWAITn to 1.
When DMA transfer is started, transfer is performed while an instruction is executed. At this time, the operation of
To output a pulse with a width of 10 clocks of the operating frequency from the P10 pin, for example, the clock
After setting DWAITn to 1, it takes two clocks until a DMA transfer is held pending.
Caution When DMA transfer is held pending while using both DMA channels, be sure to held the
Remarks 1. n: DMA channel number (n = 0, 1)
Figure 16-10. Example of Setting for Holding DMA Transfer Pending by DWAITn
2. 1 clock: 1/f
DMA transfer pending for both channels (by setting DWAIT0 and DWAIT1 to 1). If the DMA
transfer of one channel is executed while that of the other channel is held pending, DMA
transfer might not be held pending for the latter channel.
CLK
(f
CLK
: CPU clock)
CHAPTER 16 DMA CONTROLLER
User’s Manual U19678EJ1V1UD
Starting DMA transfer
Wait for 2 clocks
Wait for 9 clocks
Main program
DWAITn = 1
DWAITn = 0
P10 = 1
P10 = 0
861