R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 214

• 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 14.45
TRDIOji input signal
14.3.5.1
fOCO40M
TRDCLK
Sampling clock
TRDIOji input signal
Input signal through
digital filtering
The TRDIOji input is sampled, and when the sampled input level matches 3 times, its level is determined.
Select the digital filter function and sampling clock by the TRDDFi register.
f32
f8
f4
f2
f1
Feb 29, 2008
= 011b
Timer RD operation clock
= 100b
= 010b
Digital Filter
Block Diagram of Digital Filter
i = 0 or 1, j = either A, B, C, or D
TCK0 to TCK2: Bits in TRDCRi register
DFCK0 to DFCK1 and DFj: Bits in TRDDF register
IOA0 to IOA2 and IOB0 to IOB2: Bits in TRDIORAi register
IOC0 to IOC3 and IOD0 to IOD3: Bits in TRDIORCi register
Clock period selected by
= 001b
bits TCK2 to TCK0 or
bits DFCK1 to DFCK0
= 101b
D
D
f1, fOCO40M)
= 000b
Latch
Latch
TCK2 to TCK0
C
C
Q
Q
= 110b
Page 195 of 485
Count source
D
f32
f8
f1
Latch
C
= 01b
= 10b
= 00b
= 11b
DFCK1 to DFCK0
Q
Transmission cannot be
performed without 3-time match
because the input signal is
assumed to be noise.
D
Latch
C
Sampling clock
Q
D
Latch
C
Q
detection
Match
circuit
Signal transmission delayed
up to 5-sampling clock
Recognition of the
signal change with
3-time match
1
0
DFj
Edge detection
IOC3 to IOC0
IOD3 to IOD0
IOA2 to IOA0
IOB2 to IOB0
circuit
14. Timers