參數(shù)資料
型號(hào)： 4250
英文描述： Low-Cost, 2.7V to 5.5V Temperature Switches in a SOT23
中文描述： 4250組數(shù)據(jù)表數(shù)據(jù)表652K/NOV.30.97
文件頁(yè)數(shù)： 22/59頁(yè)
文件大?。?/td> 652K
代理商： 4250
21
MITSUBISHI MICROCOMPUTERS
4250 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
The 4250 Group timer consists of the following circuits.
Prescaler : frequency divider
Timer 1 : 8-bit programmable timer with the interrupt function
These timers can be controlled with the timer control register V1
and key-on wakeup control register K0.
Each function is described below.
Table 9 Function related timers
Circuit
Prescaler
Timer 1
Structure
Frequency divider
8-bit programmable
binary down counter
Count source
Instruction clock
Prescaler output (ORCLK)
Frequency
dividing ratio
4, 512
1 to 256
Use of output signal
Timer 1 count source
T
OUT
pin
Timer 1 interrupt
Fig. 19 Timers structure
Control
register
V1
K0
V1
Count source is stopped by clearing to “0.”
Data is automatically set from a reload register
when timer 1 underflows (auto-reload function).
Timer 1 reload register R 1(8)
inT1AB
Timer 1 (8)
Register B(4)
TAB1 instruction
T1F
Timer 1
interrupt
Register A(4)
TAB1
instruction
Bit 7
Bit 0
1/2
1
0
V1
3
G
1
output
G
1
/T
OUT
G
1
input
Instruction clock
X
IN
ORCLK
1/4
1/512
V1
2
0
1
0
1
K0
3
Prescaler
1
0
V1
2
(Note)
Timer 1 underflow
signal
Internal clock
generating circuit
(divided by 4)
Note:
:
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