DF2148RTE20IV Renesas Electronics America, DF2148RTE20IV Datasheet - Page 385
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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Switching of Internal Clock and FRC Operation
When the internal clock is changed, the changeover may cause FRC to increment. This depends on
the time at which the clock select bits (CKS1 and CKS0) are rewritten, as shown in table 11.5.
When an internal clock is used, the FRC clock is generated on detection of the falling edge of the
internal clock scaled from the system clock ( ). If the clock is changed when the old source is high
and the new source is low, as in case no. 3 in table 11.5, the changeover is regarded as a falling
edge that triggers the FRC increment clock pulse.
Switching between an internal and external clock can also cause FRC to increment.
Table 11.5 Switching of Internal Clock and FRC Operation
No.
1
2
Timing of Switchover
by Means of CKS1
and CKS0 Bits
Switching from
low to low
Switching from
low to high
FRC Operation
Clock before
switchover
Clock after
switchover
FRC clock
FRC
Clock before
switchover
Clock after
switchover
FRC clock
FRC
N
N
CKS bit rewrite
Rev. 4.00 Sep 27, 2006 page 339 of 1130
Section 11 16-Bit Free-Running Timer
N + 1
CKS bit rewrite
N + 1
REJ09B0327-0400
N + 2
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