DF2148BTE20 Renesas Electronics America, DF2148BTE20 Datasheet - Page 462

• Manufacturer Part Number: DF2148BTE20
• Description: IC H8S MCU FLASH 128K 100-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148BTE20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, IrDA, SCI, X-Bus
• Peripherals: PWM, WDT
• Number Of I /o: 74
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K 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: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F2148BTE20; HD64F2148BTE20

Section 15 Serial Communication Interface (SCI and IrDA)
15.9
15.9.1
SCI operation can be disabled or enabled using the module stop control register. The initial setting
is for SCI operation to be halted. Register access is enabled by clearing module stop mode. For
details, refer to section 26, Power-Down Modes.
15.9.2
When framing error detection is performed, a break can be detected by reading the RxD pin value
directly. In a break, the input from the RxD pin becomes all 0s, and so the FER flag in SSR is set,
and the PER flag may also be set. Note that, since the SCI continues the receive operation even
after receiving a break, even if the FER flag is cleared to 0, it will be set to 1 again.
15.9.3
When the TE bit in SCR is 0, the TxD pin is used as an I/O port whose direction (input or output)
and level are determined by DR and DDR of the port. This can be used to set the TxD pin to the
mark state (high level) or send a break during serial data transmission. To maintain the
communication line at mark state until TE is set to 1, set both DDR and DR to 1. Since the TE bit
is cleared to 0 at this point, the TxD pin becomes an I/O port, and 1 is output from the TxD pin. To
send a break during serial transmission, first set DDR to 1 and DR to 0, and then clear the TE bit
to 0. When the TE bit is cleared to 0, the transmitter is initialized regardless of the current
transmission state, the TxD pin becomes an I/O port, and 0 is output from the TxD pin.
15.9.4
Transmission cannot be started when a receive error flag (ORER, FER, or RER) is SSR is set to 1,
even if the TDRE flag in SSR is cleared to 0. Be sure to clear the receive error flags to 0 before
starting transmission. Note also that the receive error flags cannot be cleared to 0 even if the RE
bit in SCR is cleared to 0.
15.9.5
Data can be written to TDR irrespective of the TDRE flag status in SSR. However, if the new data
is written to TDR when the TDRE flag is 0, that is, when the previous data has not been
transferred to TSR yet, the previous data in TDR is lost. Be sure to write transmit data to TDR
after verifying that the TDRE flag is set to 1.
Rev. 3.00 Mar 21, 2006 page 406 of 788
REJ09B0300-0300
Usage Notes
Module Stop Mode Setting
Break Detection and Processing
Mark State and Break Detection
Receive Error Flags and Transmit Operations (Clocked Synchronous Mode Only)
Relation between Writing to TDR and TDRE Flag