DF3052BX25V Renesas Electronics America, DF3052BX25V Datasheet - Page 511

• Manufacturer Part Number: DF3052BX25V
• Description: MCU 5V 512K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of DF3052BX25V

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

operation, the serial clock is output until an overrun error occurs or the RE bit is cleared to 0. For
character-by-character reception, an external clock should be selected as the clock source.
Transmitting and Receiving Data
SCI Initialization (Synchronous Mode)
Before transmitting or receiving, clear the TE and RE bits to 0 in SCR, then initialize the SCI
as follows.
When changing the communication mode or format, always clear the TE and RE bits to 0
before following the procedure given below. Clearing the TE bit to 0 sets the TDRE flag to 1
and initializes TSR. Clearing the RE bit to 0, however, does not initialize the RDRF, PER,
FER, and ORE flags and RDR, which retain their previous contents.
Figure 13.15 is a sample flowchart for initializing the SCI.
Note: In simultaneous transmitting and receiving, the TE and RE bits should be cleared to 0 or set to 1
Start transmitting or receiving
CKE1, and CKE0 bits in SCR
Set RIE, TIE, TEIE, MPIE,
Set TE or RE to 1 in SCR
(leaving TE and RE bits
Set RIE, TIE, TEIE, and
MPIE bits as necessary
Select communication
simultaneously
Clear TE and RE bits
Start of initialization
Set value in BRR
format in SMR
cleared to 0)
1 bit interval
to 0 in SCR
elapsed?
Figure 13.15 Sample Flowchart for SCI Initialization
Yes
Wait
No
1
2
3
4
1. Select the clock source in SCR. Clear the RIE, TIE,
2. Select the communication format in SMR.
3. Write the value corresponding to the bit rate in
4. Wait for at least the interval required to transmit or
TEIE, MPIE, TE, and RE bits to 0.
BRR. This step is not necessary when an external
clock is used.
receive one bit, then set the TE or RE bit to 1 in
SCR. Also set the RIE, TIE, TEIE, and MPIE bits
as necessary. Setting the TE or RE bit enab les the
SCI to use the TxD or RxD pin.
Section 13 Serial Communication Interface
Rev. 3.00 Mar 21, 2006 page 481 of 814
REJ09B0302-0300