HD6477021X20V Renesas Electronics America, HD6477021X20V Datasheet - Page 362

• Manufacturer Part Number: HD6477021X20V
• Description: MCU 5V 32K PB-FREE 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7020r

Specifications of HD6477021X20V

• Core Processor: SH-1
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: EBI/EMI, SCI
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: OTP
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• 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: -
• Data Converters: -

13.2.4
The transmit data register (TDR) is an eight-bit register that stores data for serial transmission.
When the SCI detects that the transmit shift register (TSR) is empty, it moves transmit data written
in the TDR into the TSR and starts serial transmission. Continuous serial transmission is possible
by writing the next transmit data in the TDR during serial transmission from the TSR.
The CPU can always read and write the TDR. The TDR is initialized to H'FF by a reset or in
standby mode.
13.2.5
The serial mode register (SMR) is an eight-bit register that specifies the SCI serial communication
format and selects the clock source for the baud rate generator.
The CPU can always read and write the SMR. The SMR is initialized to H'00 by a reset or in
standby mode.
• Bit 7 (communication mode (C/A)): C/A selects whether the SCI operates in the asynchronous
Bit 7: C/A
0
1
or clocked synchronous mode.
Initial value:
Initial value:
Bit name:
Bit name:
Transmit Data Register
Serial Mode Register
R/W:
R/W:
Bit:
Bit:
R/W
R/W
C/A
7
1
7
0
Description
Synchronous mode (initial value)
Clocked synchronous mode
CHR
R/W
R/W
6
1
6
0
R/W
R/W
PE
5
1
5
0
R/W
R/W
O/E
4
1
4
0
STOP
R/W
R/W
3
1
3
0
R/W
R/W
MP
2
1
2
0
CKS1
R/W
R/W
RENESAS 345
1
1
1
0
CKS0
R/W
R/W
0
1
0
0