DF3048BVX25V Renesas Electronics America, DF3048BVX25V Datasheet - Page 531

• Manufacturer Part Number: DF3048BVX25V
• Description: MCU 3/5V 128K PB-FREE 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of DF3048BVX25V

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K 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: Lead free / RoHS Compliant
• Eeprom Size: -

In transmitting serial data, the SCI operates as follows.
1. The SCI monitors the TDRE flag in SSR. When the TDRE flag is cleared to 0 the SCI
2. After loading the data from TDR into TSR, the SCI sets the TDRE flag to 1 and starts
3. The SCI checks the TDRE flag when it outputs the MSB (bit 7). If the TDRE flag is 0, the SCI
4. After the end of serial transmission, the SCK pin is held in a constant state.
Figure 13.17 shows an example of SCI transmit operation.
Serial clock
Serial data
TDRE
TEND
recognizes that TDR contains new data, and loads this data from TDR into TSR.
transmitting. If the TIE bit is set to 1 in SCR, the SCI requests a transmit-data-empty interrupt
(TXI) at this time.
If clock output is selected, the SCI outputs eight serial clock pulses. If an external clock source
is selected, the SCI outputs data in synchronization with the input clock. Data is output from
the TxD pin in order from LSB (bit 0) to MSB (bit 7).
loads data from TDR into TSR and begins serial transmission of the next frame. If the TDRE
flag is 1, the SCI sets the TEND flag to 1 in SSR, and after transmitting the MSB, holds the
TxD pin in the MSB state. If the TEIE bit in SCR is set to 1, a transmit-end interrupt (TEI) is
requested at this time.
TXI
request
Figure 13.17 Example of SCI Transmit Operation
TXI interrupt handler
writes data in TDR
and clears TDRE
flag to 0
Bit 0
Transmit
direction
Bit 1
1 frame
Bit 7
TXI
request
Section 13 Serial Communication Interface
Rev. 3.00 Sep 27, 2006 page 503 of 872
Bit 0
Bit 1
Bit 6
REJ09B0325-0300
Bit 7
TEI
request