HD64F3026X25 Renesas Electronics America, HD64F3026X25 Datasheet - Page 440

• Manufacturer Part Number: HD64F3026X25
• Description: MCU 3V 256K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of HD64F3026X25

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: SCI, SmartCard
• Peripherals: PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 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: Contains lead / RoHS non-compliant
• Eeprom Size: -

Section 12 Serial Communication Interface
Clock
An internal clock generated by the on-chip baud rate generator or an external clock input from the
SCK pin can be selected by means of the C/
bit in SMR and the CKE1 and CKE0 bits in SCR.
A
See table 12.9 for details of SCI clock source selection.
When the SCI operates on an internal clock, it outputs the clock source at the SCK pin. Eight
clock pulses are output per transmitted or received character. When the SCI is not transmitting or
receiving, the clock signal remains in the high state. If receiving in single-character units is
required, an external clock should be selected.
Transmitting and Receiving Data
SCI Initialization (Synchronous Mode): Before transmitting or receiving data, 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 TE to 0 sets the TDRE flag to 1 and initializes
TSR. Clearing RE to 0, however, does not initialize the RDRF, PER, FER, and ORER flags, or
RDR, which retain their previous contents.
Figure 12.15 shows a sample flowchart for initializing the SCI.
Rev. 2.00 Sep 20, 2005 page 400 of 800
REJ09B0260-0200