R5F21191SP#U0 Renesas Electronics America, R5F21191SP#U0 Datasheet - Page 120

• 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
Figure 14.1
INT11/CNTR01
INT10/CNTR00
Timer X is an 8-bit timer with an 8-bit prescaler.
The prescaler and timer each consist of a reload register and counter. The reload register and counter
are allocated at the same address, and can be accessed when accessing registers PREX and TX (refer
to Tables 14.2 to 14.6 the Specifications of Each Modes).
Figure 14.1 shows a Block Diagram of Timer X. Figures 14.2 and 14.3 show the registers associated
with Timer X.
Timer X has the following five operating modes:
•
•
•
•
•
Timer mode:
Pulse output mode:
Event counter mode:
Pulse width measurement mode:
Pulse period measurement mode: The timer measures the pulse period of an external pulse.
Timer X
Apr 14, 2006
CNTRSEL = 1
CNTR0
CNTRSEL = 0
Block Diagram of Timer X
fRING
TXCK1 to TXCK0
f1
f8
f2
TXMOD1 to TXMOD0
bits = 01b
= 00b
= 01b
= 10b
= 11b
TXOCNT bit
switching
Polarity
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TXMOD1 to TXMOD0
= 00b or 01b
= 11b
= 10b
R0EDG = 1
R0EDG = 0
The timer counts the internal count source.
The timer counts the internal count source and outputs pulses
which invert the polarity by underflow of the timer.
The timer counts external pulses.
The timer measures the pulse width of an external pulse.
TXS bit
Q
Q
Toggle flip-flop
TXMOD0 to TXMOD1, R0EDG, TXS, TXOCNT: Bits in TXMR register
TXCK0 to TXCK1: Bits in TCSS register
CNTRSEL: Bit in UCON register
CLR
Reload register
PREX register
Counter
CK
Data bus
Write to TX register
Bits TXMOD1 to TXMOD0 = 01b
Reload register
TX register
Counter
Timer X interrupt
INT1 interrupt
14. Timers