參數(shù)資料
型號(hào)： M34502E4FP
元件分類(lèi)： 微控制器/微處理器
英文描述： 4-BIT, OTPROM, MICROCONTROLLER, PDSO24
封裝： 5.30 X 10.10 MM, 0.80 MM PITCH, PLASTIC, SSOP-24
文件頁(yè)數(shù)： 34/116頁(yè)
文件大?。?/td> 896K
代理商： M34502E4FP
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Rev.3.01
2005.02.02
page 24 of 112
REJ03B0105-0301
4502 Group
TIMERS
The 4502 Group has the following timers.
Programmable timer
The programmable timer has a reload register and enables the
frequency dividing ratio to be set. It is decremented from a set-
ting 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 reg-
ister, and count continues (auto-reload function).
Fixed dividing frequency timer
The fixed dividing frequency timer has the fixed frequency divid-
ing ratio (n). An interrupt request flag is set to “1” after every n
count of a count pulse.
Fig. 21 Auto-reload function
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 interrupt
request flag
T
h
e
c
o
n
te
n
ts
o
f
c
o
u
n
te
r
“1”
“0”
Count source
Instruction clock
Prescaler output (ORCLK)
Timer 1 underflow
Prescaler output (ORCLK)
CNTR input
System clock
Instruction clock
Structure
Frequency divider
8-bit programmable
binary down counter
(link to INT input)
8-bit programmable
binary down counter
16-bit fixed dividing
frequency binary down
counter
Circuit
Prescaler
Timer 1
Timer 2
16-bit timer
Use of output signal
Timer 1 and 2 count sources
Timer 2 count source
CNTR output
Timer 1 interrupt
CNTR output
Timer 2 interrupt
Watchdog timer
(The 16th bit is counted twice)
Frequency
dividing ratio
4, 16
1 to 256
65536
Control
register
W1
W2
W6
W2
W6
The 4502 Group timer consists of the following circuits.
Prescaler : frequency divider
Timer 1 : 8-bit programmable timer
Timer 2 : 8-bit programmable timer
(Timers 1 and 2 have the interrupt function, respectively)
16-bit timer
Prescaler and timers 1 and 2 can be controlled with the timer con-
trol registers W1, W2 and W6. The 16-bit timer is a free counter
which is not controlled with the control register.
Each function is described below.
Table 9 Function related timers
相關(guān)PDF資料
PDF描述
M34502M4-XXXFP 4-BIT, MROM, MICROCONTROLLER, PDSO24
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M34502M2 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
M34502M2-XXXFP 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
M34502M4 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
M34502M4-XXXFP 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
M34506E4 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
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