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M34286G2-XXXGP Datasheet(PDF) 11 Page - Renesas Technology Corp

Part # M34286G2-XXXGP
Description  SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M34286G2-XXXGP Datasheet(HTML) 11 Page - Renesas Technology Corp

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Rev.1.00
Aug 06, 2008
page 11 of 64
REJ03B0251-0100
4286 Group
Fig. 12 Auto-reload function
TIMERS
The 4286 Group has the programmable timer.
• Programmable timer
The programmable timer has a reload register and enables
the frequency dividing ratio to be set. It is decremented from a
setting value n. When it underflows (count to n + 1), a timer 1
underflow flag is set to “1,” new data is loaded from the reload
register, and count continues (auto-reload function).
FF16
n
0016
n: Counter initial value
Count starts
Reload
Reload
1st underflow
2nd underflow
n+1 count
n+1 count
Time
A skip instruction is executed
Timer 1 underflow flag “1”
“0”
The 4286 Group timer consists of the following circuit.
•Timer 1 : 8-bit programmable timer
•Timer 2 : 8-bit programmable timer
These timers can be controlled with the timer control registers
V1 and V2.
Each timer function is described below.
Table 3 Function related timer
Circuit
Timer 1
Timer 2
14-bit timer
Structure
8-bit programmable
binary down counter
8-bit programmable
binary down counter
14-bit fixed frequency
Count source
• Carrier wave output (CARRY)
• Bit 5 of watchdog timer
• f(XIN)
• f(XIN)/2
• Instruction clock
Frequency
dividing ratio
1 to 256
1 to 256
16384
Use of output signal
• Carrier wave output control
• Carrier wave output
• Watchdog timer
• Timer 1 count source
Control
register
V1
V2


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