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HT56RB688 データシート(PDF) 50 Page - Holtek Semiconductor Inc

部品番号 HT56RB688
部品情報  TinyPowerTM A/D Type Smart Card OTP MCU with LCD, DAC, ISO 7816 and USB Interfaces
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メーカー  HOLTEK [Holtek Semiconductor Inc]
ホームページ  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT56RB688 データシート(HTML) 50 Page - Holtek Semiconductor Inc

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Timer/Event Counters
The provision of timers form an important part of any microcontroller, giving the designer a means of
carrying out time related functions. The device contains several 8-bit and 16-bit count-up timers. As
each timer has three different operating modes, they can be configured to operate as a general timer, an
external event counter or as a pulse width measurement device. The provision of a prescaler to the
clock circuitry of the 8-bit Timer/Event Counter also gives added range to this timer.
There are two types of registers related to the Timer/Event Counters. The first are the registers that
contain the actual value of the Timer/Event Counter and into which an initial value can be preloaded.
Reading from these registers retrieves the contents of the Timer/Event Counter. The second type of
associated register is the Timer Control Register which defines the timer options and determines how
the Timer/Event Counter is to be used. The Timer/Event Counters can have their clock configured to
come from an internal clock source. In addition, their clock source can also be configured to come
from an external timer pin.
Rev. 1.10
50
April 15, 2013
HT56RB688
TinyPowerTM A/D type Smart Card OTP MCU
with LCD, DAC, ISO 7816 and USB Interfaces
T M R n
T i m e r / E v e n t C o u n t e r
M o d e C o n t r o l
T n O N
P r e l o a d R e g i s t e r
T i m e r / E v e n t
C o u n t e r
D a t a B u s
R e l o a d
O v e r f l o w
t o I n t e r r u p t
2
7 - s t a g e P r e s c a l e r
T n P S C 2 ~ T n P S C 0
( 1 / 1 ~ 1 / 1 2 8 )
8 - b i t T i m e r / E v e n t C o u n t e r
T n M 1 T n M 0
f S Y S
P F D 0
¸
T n E
F i l t e r
T M n F L T
( F i l t e r O n / O f f c o n t r o l )
8-bit Timer/Event Counter Structure
T M R n
T n E
T i m e r / E v e n t C o u n t e r
M o d e C o n t r o l
1 6 - B i t
P r e l o a d R e g i s t e r
D a t a B u s
R e l o a d
O v e r f l o w
t o I n t e r r u p t
L o w B y t e
B u f f e r
T n M 1
T n M 0
T n O N
H i g h B y t e L o w B y t e
1 6 - b i t T i m e r / E v e n t C o u n t e r
P F D 1
2
¸
T n S
M
U
X
f S Y S / 4
M
U
X
f S U B
E x t e r n a l 3 2 7 6 8 H z
I n t e r n a l 3 2 K - I N T
C o n f i g u r a t i o n
O p t i o n
F i l t e r
T M n F L T
( F i l t e r O n / O f f c o n t r o l )
16-bit Timer/Event Counter Structure
M
U
X
P F D 0
P F D 1
C o n f i g u r a t i o n
O p t i o n
P F D


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