R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 178

• 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
14.2.3
Table 14.9
NOTES:
Count sources
Count operations
One-shot pulse
output time
Count start conditions • The TSTART bit in the TRBCR register is set to 1 (count starts) and the next
Count stop conditions • When reloading completes after timer RB underflows during primary period.
Interrupt request
generation timing
TRBO pin function
INT0 pin functions
Read from timer
Write to timer
Select functions
1. The set value is reflected at the following one-shot pulse after writing to the TRBPR register.
2. Do not set both the TRBPRE and TRBPR registers to 00h.
In programmable one-shot generation mode, a one-shot pulse is output from the TRBO pin by a program or an
external trigger input (input to the INT0 pin) (refer to Table 14.9 Programmable One-Shot Generation Mode
Specifications). When a trigger is generated, the timer starts operating from the point only once for a given
period equal to the set value in the TRBPR register. The TRBSC register is not used in this mode.
Figure 14.20 shows the TRBIOC Register in Programmable One-Shot Generation Mode. Figure 14.21 shows
an Operating Example of Programmable One-Shot Generation Mode.
Feb 29, 2008
Item
Programmable One-shot Generation Mode
Programmable One-Shot Generation Mode Specifications
f1, f2, f8, timer RA underflow
• Decrement the setting value in the TRBPR register
• When the timer underflows, it reloads the contents of the reload register before
• When the count stops, the timer reloads the contents of the reload register
(n+1)(m+1)/fi
fi: Count source frequency,
n: Setting value in TRBPRE register, m: Setting value in TRBPR register
• Set the TOSST bit in the TRBOCR register to 1 (one-shot starts)
• Input trigger to the INT0 pin
• When the TOSSP bit in the TRBOCR register is set to 1 (one-shot stops).
• When the TSTART bit in the TRBCR register is set to 0 (count stops).
• When the TSTOP bit in the TRBCR register is set to 1 (count forcibly stops).
In half a cycle of the count source, after the timer underflows (at the same time as
the TRBO output ends) [timer RB interrupt]
Pulse output
• When the INOSTG bit in the TRBIOC register is set to 0 (INT0 one-shot trigger
• When the INOSTG bit in the TRBIOC register is set to 1 (INT0 one-shot trigger
The count value can be read out by reading registers TRBPR and TRBPRE.
• When registers TRBPRE and TRBPR are written while the count is stopped,
• When registers TRBPRE and TRBPR are written during the count, values are
• Output level select function
• One-shot trigger select function
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the count completes and the TOSSTF bit is set to 0 (one-shot stops).
before it stops.
trigger is generated.
disabled): programmable I/O port or INT0 interrupt input
enabled): external trigger (INT0 interrupt input)
values are written to both the reload register and counter.
written to the reload register only (the data is transferred to the counter at the
following reload).
The TOPL bit in the TRBIOC register selects the output level of the one-shot
pulse waveform.
Refer to 14.2.3.1 One-Shot Trigger Selection.
(1)
Specification
(2)
14. Timers