D12321VF20V Renesas Electronics America, D12321VF20V Datasheet - Page 599
D12321VF20V
Manufacturer Part Number
D12321VF20V
Description
IC H8S/2321 MCU ROMLESS 128QFP
Manufacturer
Renesas Electronics America
Series
H8® H8S/2300r
Specifications of D12321VF20V
Core Processor
H8S/2000
Core Size
16-Bit
Speed
20MHz
Connectivity
SCI, SmartCard
Peripherals
POR, PWM, WDT
Number Of I /o
86
Program Memory Type
ROMless
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 8x10b; D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
128-QFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Program Memory Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
D12321VF20V
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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12.3
12.3.1
TCNT is incremented by input clock pulses (either internal or external).
Internal Clock: Three different internal clock signals (φ/8, φ/64, or φ/8192) divided from the
system clock (φ) 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.
φ
Internal clock
Clock input
to TCNT
TCNT
Operation
TCNT Incrementation Timing
Figure 12.2 Count Timing for Internal Clock Input
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N
Rev.6.00 Sep. 27, 2007 Page 567 of 1268
Section 12 8-Bit Timers
REJ09B0220-0600
N+1
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