R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 160

• 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
14.1.3
Table 14.4
NOTE:
Count source
Count operations
Divide ratio
Count start condition
Count stop conditions • 0 (count stops) is written to the TSTART bit in the TRACR register.
Interrupt request
generation timing
INT1/TRAIO pin
function
TRAO pin function
Read from timer
Write to timer
Select functions
1. The level of the output pulse becomes the level when the pulse output starts when the TRAMR
In event counter mode, external signal inputs to the INT1/TRAIO pin are counted (refer to Table 14.4 Event
Counter Mode Specifications).
Figure 14.7 shows the TRAIOC Register in Event Counter Mode.
register is written to.
Feb 29, 2008
Item
Event Counter Mode
Event Counter Mode Specifications
External signal which is input to TRAIO pin (active edge selectable by a program)
• Decrement
• When the timer underflows, the contents of the reload register are reloaded and
1/(n+1)(m+1)
n: setting value of TRAPRE register, m: setting value of TRA register
1 (count starts) 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].
Count source input (INT1 interrupt input)
Programmable I/O port or pulse output
The count value can be read by reading registers TRA and TRAPRE.
• When registers TRAPRE and TRA are written while the count is stopped, values
• When registers TRAPRE and TRA are written during the count, values are
• NT1 input polarity switch function
• Count source input pin select function
• Pulse output function
• Digital filter function
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the count is continued.
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 active edge of the count
source.
P1_7 or P1_5 is selected by the TIOSEL bit in the TRAIOC register.
Pulses of inverted polarity can be output from the TRAO pin each time the timer
underflows (selectable by the TOENA 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
(1)
(1)
14. Timers