參數(shù)資料
型號(hào)： MTA85801S-10I/SS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 10 MHz, RISC MICROCONTROLLER, PDSO20
封裝： 0.209 INCH, PLASTIC, SSOP-20
文件頁數(shù)： 5/72頁
文件大?。?/td> 760K
代理商： MTA85801S-10I/SS
1995 Microchip Technology Inc.
DS40115C-page 13
MTA85XXX
FIGURE 5-2:
T0CKI BLOCK DIAGRAM (SIMPLIFIED)
FIGURE 5-3:
T0CKI TIMING: INT CLOCK/NO PRESCALE
FIGURE 5-4:
T0CKI TIMING: INT CLOCK/PRESCALE 1:2
FIGURE 5-5:
T0CKI TIMING WITH EXTERNAL CLOCK
Note 1:
Bits, RTE, RTS, PS2, PS1, PS0 and PSA are located in the OPTION register.
Note 2: The prescaler is shared with Watchdog Timer.
T0CKI
RTE
0
1
0
pin
RTS
fOSC/4
Programmable
Prescaler
Sync with
Internal
clocks
T0CKI (8)
PSout
(2 cycle delay)
Data bus
8
PSA
PS2, PS1, PS0
PC-1
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
PC
(Program
Counter)
Instruction
Fetch
T0CKI
PC
PC+1
PC+2
PC+3
PC+4
PC+5
PC+6
RT
RT+1
RT+2
NRT
NRT+1
NRT+2
NRT+3
T0
MOVWF T0CKI
MOVF T0CKI,W MOVF T0CKI,W MOVF T0CKI,W MOVF T0CKI,W MOVF T0CKI,W
Write T0CKI
executed
Read T0CKI
reads NRT
Read T0CKI
reads NRT
Read T0CKI
reads NRT+1
Read T0CKI
reads NRT+2
Read T0CKI
reads NRT+3
PC-1
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
PC
(Program
Counter)
Instruction
Fetch
T0CKI
PC
PC+1
PC+2
PC+3
PC+4
PC+5
PC+6
RT
NRT+1
MOVWF T0CKI
MOVF T0CKI,W MOVF T0CKI,W MOVF T0CKI,W MOVF T0CKI,W MOVF T0CKI,W
Write T0CKI
executed
Read T0CKI
reads NRT
Read T0CKI
reads NRT
Read T0CKI
reads NRT
Read T0CKI
reads NRT
Read T0CKI
reads NRT + 1
RT+1
NRT
INCREMENT T0CKI (Q4)
EXT CLOCK INPUT OR
Q1
Q2
Q3 Q4
Q1
Q2
Q3 Q4
Q1
Q2
Q3 Q4
Q1
Q2
Q3 Q4
T0CKI
RR + 1
R + 2
Small pulse
misses sampling
EXT CLOCK/PRESCALER
OUTPUT AFTER SAMPLING
(note 3)
1.
2.
3.
Delay from clock input change to T0CKI increment is 3 TOSC to 7 TOSC. (Duration of Q = TOSC).
Therefore, the error in measuring the interval between two edges on T0CKI input =
± 4 TOSC maximum.
External clock if no prescaler selected, Prescaler output otherwise.
The arrows indicate the points in time where sampling occurs.
Notes:
PRESCALER OUT (NOTE 2)
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