R5F21191SP#U0 Renesas Electronics America, R5F21191SP#U0 Datasheet - Page 127

• Manufacturer Part Number: R5F21191SP#U0
• Description: IC R8C MCU FLASH 8K 20SSOP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/19r

Specifications of R5F21191SP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SIO, UART/USART
• Peripherals: LED, POR, Voltage Detect, WDT
• Number Of I /o: 13
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x1b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 20-SSOP
• For Use With: R0K521134S000BE - KIT EVAL STARTER FOR R8C/13R0E521174CPE10 - EMULATOR COMPACT R8C/18/19/1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/18 Group, R8C/19 Group
Rev.1.30
REJ09B0222-0130
14.1.4
Table 14.5
Count sources
Count operations
Count start condition
Count stop condition
Interrupt request
generation timing
INT10/CNTR00,
INT11/CNTR01
pin functions
CNTR0 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/CNTR0 pin
is measured (refer to Table 14.5 Pulse Width Measurement Mode Specifications). Figure 14.7
shows the TXMR Register in Pulse Width Measurement Mode. Figure 14.8 shows an Operating
Example in Pulse Width Measurement Mode.
Apr 14, 2006
Item
Pulse Width Measurement Mode
Pulse Width Measurement Mode Specifications
Page 110 of 233
f1, f2, f8, fRING
• Decrement
• Continuously counts the selected signal only when the measured pulse is “H”
• When the timer underflows, the contents of the reload register are reloaded
1 (count starts) is written to the TXS bit in the TXMR register.
0 (count stops) is written to the TXS bit in the TXMR register.
• When timer X underflows [timer X interrupt].
• Rising or falling of the CNTR0 input (end of measurement period) [INT1
Measured pulse input (INT1 interrupt input)
Programmable I/O port
The count value can be read out by reading registers TX and PREX.
• When registers TX and PREX are written while the count is stopped, values
• When registers TX and PREX are written during the count, the value is written
• INT1/CNTR0 signal polarity switch function
• Measured pulse input pin select function
level, or conversely only “L” level.
and the count is continued.
interrupt]
are written to both the reload register and counter.
to each reload register of registers TX and PREX at the following count source
input, the data is transferred to the counter at the second count source input,
and the count re-starts at the third count source input.
The R0EDG bit can select “H” or “L” level period for the input pulse width
measurement.
The CNTRSEL bit in the UCON register can select the CNTR00 or CNTR01
pin.
Specification
14. Timers