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參數(shù)資料
型號: HMS77C1001A
廠商: Hynix Semiconductor Inc.
元件分類: 數(shù)學(xué)處理器
英文描述: 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述: 8位單晶片微控制器
文件頁數(shù): 30/45頁
文件大小: 549K
代理商: HMS77C1001A
HMS77C1000A/HMS77C1001A
Oct. 2001 Ver. 2.0
27
11.1 Timer Mode
If the OPTION register bit5(T0CS) is cleared, the timer
mode is selected and is operated with internal system clock
(T
CY
). The Timer0 module will increment every instruc-
tion cycle (without prescaler). If TMR0 register is written,
the increment is inhibited for the following two cycles. The
user can work around this by writing an adjusted value to
the TMR0 register.
Figure 11-3 and Figure 11-4 show the timing diagram of
Timer.
- No Prescaler (PSA=0)
Timer will increment every instruction cycle(Q4).
- With Prescaler (PSA=1)
Timer will increment with prescaler division ratio.
@ PS2~PS0 = (1:2) ~ (1:256)Counter Mode
11.2 Counter Mode
If the OPTION register bit5(T0CS) is set, the counter
mode is selected and operates with event clock input.
In this mode, Timer0 will increment either on every rising
or falling edge of pin EC0. The incrementing edge is deter-
mined by the source edge select bit T0SE (OPTION<4>).
Clearing the T0SE bit selects the rising edge.
FIGURE 11-3 TIMER0 TIMING: INTERNAL CLOCK/NO PRESCALE
FIGURE 11-4 TIMER0 TIMING: INTERNAL CLOCK/PRESCALER 1:2
[ W
TMR0 ]
PC-1
TMR0
Instruction
Fetch
Instruction
Executed
Q1 Q2 Q3 Q4
PC
Q1 Q2 Q3 Q4
PC+1
Q1 Q2 Q3 Q4
PC+2
Q1 Q2 Q3 Q4
PC+3
Q1 Q2 Q3 Q4
PC+4
Q1 Q2 Q3 Q4
PC+5
Q1 Q2 Q3 Q4
PC+6
Q1 Q2 Q3 Q4
[ TMR0
W ]
[ TMR0
W ]
[ TMR0
W ]
[ TMR0
W ]
[ TMR0
W ]
T0
T0+1
T0+2
NT0
NT0+1
NT0+2
Write TMR0
executed
Read TMR0
reads NT0
Read TMR0
reads NT0
Read TMR0
reads NT0
Read TMR0
reads NT0+1
Read TMR0
reads NT0+2
PC
(Program
Counter)
increment inhibited
Timer0
Clock
[ W
TMR0 ]
PC-1
TMR0
Instruction
Fetch
Instruction
Executed
Q1 Q2 Q3 Q4
PC
Q1 Q2 Q3 Q4
PC+1
Q1 Q2 Q3 Q4
PC+2
Q1 Q2 Q3 Q4
PC+3
Q1 Q2 Q3 Q4
PC+4
Q1 Q2 Q3 Q4
PC+5
Q1 Q2 Q3 Q4
PC+6
Q1 Q2 Q3 Q4
[ TMR0
W ]
[ TMR0
W ]
[ TMR0
W ]
[ TMR0
W ]
[ TMR0
W ]
T0
T0+1
NT0
NT0+1
PC
(Program
Counter)
increment inhabited
Timer0
Clock
Write TMR0
executed
Read TMR0
reads NT0
Read TMR0
reads NT0
Read TMR0
reads NT0
Read TMR0
reads NT0+1
Read TMR0
reads NT0+2
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