PIC10F200-I(2014) View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
PIC10F200-I Datasheet PDF : 88 Pages
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PIC10F200/202/204/206
FIGURE 6-3:
TIMER0 TIMING: INTERNAL CLOCK/PRESCALE 1:2
PC
(Program
Counter)
Instruction
Fetch
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 – 1
PC
PC + 1
PC + 2
PC + 3
PC + 4
PC + 5
PC + 6
MOVWF TMR0 MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W
Timer0
T0
Instruction
Executed
T0 + 1
NT0
NT0 + 1
Write TMR0 Read TMR0 Read TMR0
executed
reads NT0 reads NT0
Read TMR0 Read TMR0 Read TMR0
reads NT0 reads NT0 + 1 reads NT0 + 2
TABLE 6-1: REGISTERS ASSOCIATED WITH TIMER0
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3 Bit 2 Bit 1 Bit 0
Value on
Power-On
Reset
01h
N/A
N/A
Legend:
Note 1:
TMR0
Timer0 – 8-bit Real-Time Clock/Counter
xxxx xxxx
OPTION
GPWU GPPU T0CS T0SE PSA PS2 PS1 PS0 1111 1111
TRISGPIO(1)
—
—
—
— I/O Control Register
---- 1111
Shaded cells not used by Timer0. – = unimplemented, x = unknown, u = unchanged.
The TRIS of the T0CKI pin is overridden when T0CS = 1.
Value on
All Other
Resets
uuuu uuuu
1111 1111
---- 1111
6.1 Using Timer0 with an External
Clock (PIC10F200/202)
When an external clock input is used for Timer0, it must
meet certain requirements. The external clock
requirement is due to internal phase clock (TOSC)
synchronization. Also, there is a delay in the actual
incrementing of Timer0 after synchronization.
6.1.1
EXTERNAL CLOCK
SYNCHRONIZATION
When no prescaler is used, the external clock input is
the same as the prescaler output. The synchronization
of T0CKI with the internal phase clocks is
accomplished by sampling the prescaler output on the
Q2 and Q4 cycles of the internal phase clocks
(Figure 6-4). Therefore, it is necessary for T0CKI to be
high for at least 2 TOSC (and a small RC delay of 2
Tt0H) and low for at least 2 TOSC (and a small RC delay
of 2 Tt0H). Refer to the electrical specification of the
desired device.
When a prescaler is used, the external clock input is
divided by the asynchronous ripple counter-type
prescaler, so that the prescaler output is symmetrical.
For the external clock to meet the sampling
requirement, the ripple counter must be taken into
account. Therefore, it is necessary for T0CKI to have a
period of at least 4 TOSC (and a small RC delay of 4
Tt0H) divided by the prescaler value. The only
requirement on T0CKI high and low time is that they do
not violate the minimum pulse width requirement of
Tt0H. Refer to parameters 40, 41 and 42 in the
electrical specification of the desired device.
DS40001239F-page 24
2004-2014 Microchip Technology Inc.
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