參數(shù)資料
型號: M30625FGNGP
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP80
封裝: 14 X 14 MM, 0.65 MM PITCH, PLASTIC, QFP-80
文件頁數(shù): 10/67頁
文件大?。?/td> 2968K
代理商: M30625FGNGP
18
MITSUBISHI MICROCOMPUTERS
4551 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for
INFRARED REMOTE CONTROL TRANSMITTER
TIMERS
The 4551 Group has the programmable timers.
q Programmable timer
The programmable timer has a reload register and enables
the frequency dividing ratio to be set. It is decremented from a
set value n. When it underflows (count to n + 1), a timer interrupt
request flag is set to “1,” new data is loaded from the reload
register, and count continues (auto-reload function).
q Fixed dividing frequency timer
The fixed dividing frequency timer has the fixed frequency
dividing ratio (n). An interrupt request flag is set to “1” every n
count of a count pulse.
Fig. 18 Auto-reload function
The 4551 Group timer consists of the following circuits.
Prescaler : frequency divider
Timer 1 : 8-bit programmable timer
Timer 2 : 14-bit fixed dividing frequency timer
Timer LC : 4-bit programmable timer
(Timers 1 and 2 have the interrupt function, respectively)
Table 9 Function related timers
Prescaler, timer 1, timer 2 and timer LC can be controlled with
the timer control registers W1, W2 and W3.
Each function is described below.
Count source
Instruction clock (INSTCK)
Prescaler output (ORCLK)
Carrier generating circuit
output (CARRY, CARRY/2)
Prescaler output (ORCLK)
f(XCIN)
Bit 3 of timer 2
System clock (STCK)
Structure
Frequency divider
8-bit programmable
binary down counter
14-bit fixed dividing
frequency
4-bit programmable
binary down counter
Circuit
Prescaler
Timer 1
Timer 2
Timer LC
Use of output signal
Timer 1 and 2 count sources
Timer 1 interrupt
Port CARR output control
Timer 2 interrupt
Divider for LCD
Watchdog timer
Divider for LCD
Carrier output
Frequency
dividing ratio
4, 8
1 to 256
16384
1 to 16
Control
register
W1
W2
W3
FF16
n
0016
n : Counter initial value
Count starts
Reload
1st underflow
2nd underflow
n+1 count
Time
An interrupt occurs or
a skip instruction is executed.
Timer 1 interrupt
request flag
The
contents
of
counter
“1”
“0”
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