DF2148RTE20IV Renesas Electronics America, DF2148RTE20IV Datasheet - Page 408
DF2148RTE20IV
Manufacturer Part Number
DF2148RTE20IV
Description
MCU 5V 128K I-TEMP,PB-FREE, 100-
Manufacturer
Renesas Electronics America
Series
H8® H8S/2100r
Specifications of DF2148RTE20IV
Core Processor
H8S/2000
Core Size
16-Bit
Speed
20MHz
Connectivity
Host Interface, I²C, IrDA, SCI
Peripherals
POR, PWM, WDT
Number Of I /o
74
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
4 V ~ 5.5 V
Data Converters
A/D 8x10b; D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
100-TQFP, 100-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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Section 12 8-Bit Timers
12.3
12.3.1
TCNT is incremented by input clock pulses (either internal or external).
Internal Clock
An internal clock created by dividing the system clock ( ) can be selected by setting bits CKS2 to
CKS0 in TCR. Figure 12.2 shows the count timing.
External Clock
Three incrementation methods can be selected by setting bits CKS2 to CKS0 in TCR: at the rising
edge, the falling edge, and both rising and falling edges.
Note that the external clock pulse width must be at least 1.5 states for incrementation at a single
edge, and at least 2.5 states for incrementation at both edges. The counter will not increment
correctly if the pulse width is less than these values.
Figure 12.3 shows the timing of incrementation at both edges of an external clock signal.
Rev. 4.00 Sep 27, 2006 page 362 of 1130
REJ09B0327-0400
Internal clock
TCNT input
clock
TCNT
Operation
TCNT Incrementation Timing
Figure 12.2 Count Timing for Internal Clock Input
N – 1
N
N + 1
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