DF71251AD50FPV Renesas Electronics America, DF71251AD50FPV Datasheet - Page 444

• Manufacturer Part Number: DF71251AD50FPV
• Description: MCU RISC FLASH 32K 8K 64LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH Tinyr

Specifications of DF71251AD50FPV

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 37
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

12.3.7
SCSSR is an 8-bit register that contains status flags to indicate the SCI operating state.
The CPU can always read and write to SCSSR, but cannot write 1 to status flags TDRE, RDRF,
ORER, PER, and FER. These flags can be cleared to 0 only after 1 is read from the flags. The
TEND flag is a read-only bit and cannot be modified.
Rev. 5.00 Mar. 06, 2009 Page 424 of 770
REJ09B0243-0500
Bit
7
Serial Status Register (SCSSR)
Bit Name
TDRE
Note:
*
Initial value:
Writing 0 to this bit after reading it as 1 clears the flag and is the only allowed way.
Initial
value
1
R/W:
Bit:
R/(W)* R/(W)* R/(W)* R/(W)* R/(W)*
TDRE
7
1
R/W
R/(W)* Transmit Data Register Empty
RDRF ORER
6
0
5
0
Description
Indicates whether data has been transferred from the
transmit data register (SCTDR) to the transmit shift
register (SCTSR) and SCTDR has become ready to
be written with next serial transmit data.
0: Indicates that SCTDR holds valid transmit data
[Clearing condition]
•
1: Indicates that SCTDR does not hold valid transmit
[Setting conditions]
•
•
•
data
When 0 is written to TDRE after reading TDRE = 1
By a power-on reset or in standby mode
When the TE bit in SCSCR is 0
When data is transferred from SCTDR to SCTSR
and data can be written to SCTDR
FER
4
0
PER
3
0
TEND
R
2
1
MPB
R
1
0
MPBT
R/W
0
0