R5F21256SNFP#U0 Renesas Electronics America, R5F21256SNFP#U0 Datasheet - Page 162

• Manufacturer Part Number: R5F21256SNFP#U0
• Description: IC R8C MCU FLASH 32K 52LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/25r

Specifications of R5F21256SNFP#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: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K 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
14.1.4
Table 14.5
Count sources
Count operations
Count start condition
Count stop conditions
Interrupt request
generation timing
INT1/TRAIO pin function Measured pulse input (INT1 interrupt input)
TRAO pin function
Read from timer
Write to timer
Select functions
In pulse width measurement mode, the pulse width of an external signal input to the INT1/TRAIO pin is
measured (refer to Table 14.5 Pulse Width Measurement Mode Specifications).
Figure 14.8 shows the TRAIOC Register in Pulse Width Measurement Mode and Figure 14.9 shows an
Operating Example of Pulse Width Measurement Mode.
Feb 29, 2008
Pulse Width Measurement Mode
Item
Pulse Width Measurement Mode Specifications
Page 143 of 485
f1, f2, f8, fOCO, fC32
• Decrement
• Continuously counts the selected signal only when measurement pulse is “H”
• When the timer underflows, the contents of the reload register are reloaded
1 (count starts) is written to the TSTART bit in the TRACR register.
• 0 (count stops) is written to the TSTART bit in the TRACR register.
• 1 (count forcibly stops) is written to the TSTOP bit in the TRACR register.
• When timer RA underflows [timer RA interrupt].
• Rising or falling of the TRAIO input (end of measurement period) [timer RA
Programmable I/O port
• When registers TRAPRE and TRA are written while the count is stopped,
• When registers TRAPRE and TRA are written during the count, values are
• Measured pulse input pin select function
• Digital filter function
The count value can be read by reading registers TRA and TRAPRE.
• Measurement level select
level, or conversely only “L” level.
and the count is continued.
interrupt]
values are written to both the reload register and counter.
written to the reload register and counter (refer to 14.1.1.1 Timer Write
Control during Count Operation).
The TEDGSEL bit in the TRAIOC register selects the “H” or “L” level period.
P1_7 or P1_5 is selected by the TIOSEL bit in the TRAIOC register.
Bits TIPF0 and TIPF1 in the TRAIOC register enable or disable the digital
filter and select the sampling frequency.
Specification
14. Timers