R5F2121AJFP#U0 Renesas Electronics America, R5F2121AJFP#U0 Datasheet - Page 453

• Manufacturer Part Number: R5F2121AJFP#U0
• Description: MCU FLASH 96K 5K CMOS 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/21r

Specifications of R5F2121AJFP#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: 96KB (96K x 8)
• Program Memory Type: FLASH
• Ram Size: 5K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/20 Group, R8C/21 Group
Rev.2.00 Aug 27, 2008
REJ09B0250-0200
Figure 21.3
21.3.2.3
The following two workarounds should be performed in programmable one-shot generation mode.
•
(3) To stop the timer counting in the primary period, use the TSTOP bit in the TRBCR register. In this case,
(1) To write to registers TRBPRE and TRBPR during count operation (TCSTF bit is set to 1), note the
•
•
(2) Do not set both the TRBPRE and TRBPR registers to 00h.
Workaround example (b):
As shown in Figure 21.3 detect the start of the primary period by the TRBO pin output level and write to
registers TRBSC and TRBPR. These write operations must be completed by the beginning of period A.
If the port register’s bit value is read after the port direction register’s bit corresponding to the TRBO pin is
set to 0 (input mode), the read value indicates the TRBO pin output value.
When the TRBPRE register is written continuously during count operation (TCSTF bit is set to 1), allow
three or more cycles of the count source for each write interval.
When the TRBPR register is written continuously during count operation (TCSTF bit is set to 1), allow
three or more cycles of the prescaler underflow for each write interval.
bit corresponding to the TRBO pin
registers TRBPRE and TRBPR are initialized and their values are set to the values after reset.
following points:
(when the bit in the port direction
Read value of the port register’s
Programmable one-shot generation mode
Workaround Example (b) When TRBO Pin Output Value is Read
TRBO pin output
register is set to 0)
is detected at the end of the
The TRBO output inversion
underflow signal
Page 435 of 458
Count source/
secondary period.
prescaler
(i)
(ii) (iii)
Upon detecting (i), set the secondary and
then the primary register immediately.
Primary period
Ensure sufficient time
Secondary period
Period A
21. Usage Notes