R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 485

• Manufacturer Part Number: R5F21257SNFP#U0
• Description: IC R8C/25 MCU FLASH 52LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/25r

Specifications of R5F21257SNFP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, Voltage Detect, WDT
• Number Of I /o: 41
• Program Memory Size: 48KB (48K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.5K x 8
• Voltage - Supply (vcc/vdd): 2.2 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 52-LQFP
• For Use With: R0K521256S000BE - KIT EVAL STARTER FOR R8C/25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/24 Group, R8C/25 Group
Rev.3.00
REJ09B0244-0300
Figure 21.5
TRDGRB0 register
TRDGRA1 register
TRDGRB1 register
TRDSR0 register
TRDSR0 register
Count value in TRD0
UDF bit in
OVF bit in
•
Feb 29, 2008
The TRD1 register counts 1, 0, FFFFh, 0, 1, in that order, when changing from decrement to increment
operation.
The UDF bit is set to 1 when changing between 1, 0, and FFFFh operation. Also, when bits CMD1 to
CMD0 in the TRDFCR register are set to 10b (complementary PWM mode, buffer data transferred at
underflow in the TRD1 register), the content in the buffer registers (TRDGRD0, TRDGRC1, and
TRDGRD1) is transferred to the general registers (TRDGRB0, TRDGRA1, and TRDGRB1). During
FFFFh, 0, 1 operation, data are not transferred to registers such as the TRDGRB0 register. Also, at this
time, the OVF bit remains unchanged.
FFFFh
Operation when TRD1 Register Underflows in Complementary PWM Mode
register
1
0
1
0
1
0
Set to 0 by a program
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Transferred from
buffer register
No change
Not transferred from buffer register
When bits CMD1 to CMD0 in the
TRDFCR register are set to 10b
(transfer from the buffer register to the
general register when the TRD1 register
underflows).
21. Usage Notes