R5F21102DFP#U0 Renesas Electronics America, R5F21102DFP#U0 Datasheet - Page 75

• Manufacturer Part Number: R5F21102DFP#U0
• Description: IC R8C MCU FLASH 8K 32LQFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/10r

Specifications of R5F21102DFP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 16MHz
• Connectivity: SIO, UART/USART
• Peripherals: LED, WDT
• Number Of I /o: 22
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• For Use With: R0K521134S000BE - KIT EVAL STARTER FOR R8C/13R0E521134EPB00 - KIT EMULATOR PROBE FOR PC7501R0E521134CPE00 - EMULATOR COMPACT R8C/13
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/10 Group
Rev.1.20 Jan 27, 2006
REJ09B0019-0120
Table 12.6 Pulse Period Measurement Mode Specifications
Figure 12.9 TXMR Register in Pulse Period Measurement Mode
NOTES:
1. The period of input pulse must be longer than twice the period of prescaler X. Longer pulse for H width and L width than the
Count source
Count operation
Count start condition
Count stop condition
Interrupt request
generation timing
INT1/CNTR
CNTR
Read from timer
Write to timer
Select function
prescaler X period must be input. If shorter pulse than the period is input to the CNTR0 pin, the input may be disabled.
12.1.5 Pulse Period Measurement Mode
T i m e r X m o d e r e g i s t e r
b 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0
In this mode, the timer measures the pulse period of an external signal fed to INT1/CNTR
“Table 12.6 Pulse Period Measurement Mode Specifications”). Figure 12.9 shows the TXMR register
in pulse period measurement mode. Figure 12.10 shows an operation example in pulse period mea-
surement mode.
N O T E S:
1 . T h e I R b i t i n t h e I N T 1 I C r e g i s t e r m a y b e s e t t o “ 1 ” ( i n t e r r u p t r e q u e s t e d ) w h e n t h e R 0 E D G b i t i s r e w r i t t e n .
2 . T h i s b i t i s s e t t o “ 0 ” b y w r i t i n g “ 0 ” i n a p r o g r a m . ( I t r e m a i n s u n c h a n g e d e v e n i f w r i t i n g “ 1 ” )
0
pin function
R e f e r t o t h e p a r a g r a p h 1 9 . 2 . 5 “ C h a n g i n g I n t e r r u p t F a c t o r ” i n t h e U s a g e N o t e s R e f e r e n c e B o o k .
Item
1
0
pin function
0
page 63 of 180
0 0
B i t s y m b o l
T X U N D
T X M O D 0
T X M O D 1
T X O C N T
T X M O D 2
T X E D G
Contents in the read-out buffer can be read by reading TX register. The value retained in
f
• Down-count
• After an active edge of measurement pulse is input, contents in the read-out buffer is
Write “1” (count start) to TXS bit in TXMR register
Write “0” (count stop) to TXS bit in TXMR register
• When Timer X underflows or reloads [Timer X interrupt]
• Rising or falling of CNTR0 input (end of measurement period) [INT1 interrupt]
Measurement pulse input
Programmable I/O port
the read-out buffer is released by reading TX register.
Value written to TX register is written to both reload register and counter.
Same applies to PREX register.
• INT1/CNTR
R 0 E D G
TXS
1
retained in the first underflow of prescaler X. Then the timer X reloads contents in the
reload register in the second underflow of prescaler X and continues counting.
Measurement period of input pulse can be selected with R0EDG bit.
, f
Symbol
TXMR
2
, f
(2 )
(2 )
8
, f
32
O p e r a t i o n m o d e
s e l e c t b i t 2
Active edge
judgment flag
O p e r a t i o n m o d e
s e l e c t b i t 0 , 1
I N T 1 / C N T R 0
p o l a r i t y
s w i t c h i n g b i t
Timer X count
start flag
T i m e r X
u n d e r f l o w f l a g
S e t t o “ 0 ” i n p u l s e p e r i o d m e a s u r e m e n t m o d e
0
Bit name
polarity switching function
(1 )
Address
008B
16
(1)
b1 b0
0 0 : T i m e r m o d e o r p u l s e p e r i o d
0 : N o a c t i v e e d g e
1 : A c t i v e e d g e f o u n d
0 : Stops counting
1 : Starts counting
1 : P u l s e p e r i o d m e a s u r e m e n t m o d e
0 : N o u n d e r f l o w
1 : U n d e r f l o w f o u n d
[CNTR
0: Measures a measurement pulse from one
1: Measures a measurement pulse from one
[INT1]
0: Rising edge
1: Falling edge
(INT1 interrupt input)
rising edge to the next rising edge
falling edge to the next falling edge
_______
m e a s u r e m e n t m o d e
0
]
Specification
After reset
00
16
F u n c t i o n
RW
R W
R W
R W
R W
R W
R W
R W
R W
12.1 Timer (Timer X)
0
pin (See