HD64F3642AH Renesas Electronics America, HD64F3642AH Datasheet - Page 290
HD64F3642AH
Manufacturer Part Number
HD64F3642AH
Description
IC H8 MCU FLASH 16K 64QFP
Manufacturer
Renesas Electronics America
Series
H8® H8/300Lr
Datasheet
1.HD64F3644HV.pdf
(551 pages)
Specifications of HD64F3642AH
Core Processor
H8/300L
Core Size
8-Bit
Speed
8MHz
Connectivity
SCI
Peripherals
PWM, WDT
Number Of I /o
53
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x8b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
64-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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Section 9 Timers
4. Internal clock switching and counter operation
Table 9.19 Internal Clock Switching and FRC Operation
No.
1
2
Rev. 6.00 Sep 12, 2006 page 268 of 526
REJ09B0326-0600
Depending on the timing, FRC may be incremented by a switch between different internal
clock sources. Table 9.19 shows the relation between internal clock switchover timing (by
writing to bits CKS1 and CKS0) and FRC operation.
When FRC is internally clocked, an increment pulse is generated from the falling edge of an
internal clock signal, which is divided from the system clock ( ). For this reason, in a case like
No. 3 in table 9.19 where the switch is from a high clock signal to a low clock signal, the
switchover is seen as a falling edge, causing FRC to increment.
FRC can also be incremented by a switch between internal and external clocks.
Clock Levels Before
and After Modifying
Bits CKS1 and CKS0
Goes from low level
to low level
Goes from low
to high
FRC Operation
Clock before
switching
Clock after
switching
Count clock
FRC
Clock before
switching
Clock after
switching
Count clock
FRC
Write to CKS1 and CKS0
N
N
N + 1
Write to CKS1 and CKS0
N + 1
N + 2
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