參數(shù)資料
型號： PIC16C554-04/P
廠商： Microchip Technology
文件頁數(shù)： 53/108頁
文件大?。?/td> 0K
描述： IC MCU OTP 512X14 18DIP
產品培訓模塊： Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標準包裝： 25
系列： PIC® 16C
核心處理器： PIC
芯體尺寸： 8-位
速度： 4MHz
外圍設備： POR，WDT
輸入/輸出數(shù)： 13
程序存儲器容量： 896B（512 x 14）
程序存儲器類型： OTP
RAM 容量： 80 x 8
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 5.5 V
振蕩器型： 外部
工作溫度： 0°C ~ 70°C
封裝/外殼： 18-DIP（0.300"，7.62mm）
包裝： 管件
產品目錄頁面： 635 (CN2011-ZH PDF)
配用： ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
309-1059-ND - ADAPTER 18 ZIF BD W/18SO PLUGS
DVA16XP180-ND - ADAPTER DEVICE FOR MPLAB-ICE
AC164010-ND - MODULE SKT PROMATEII DIP/SOIC
2002 Microchip Technology Inc.
Preliminary
DS40143D-page 47
PIC16C55X
7.0
TIMER0 MODULE
The Timer0 module timer/counter has the following
features:
8-bit timer/counter
Readable and writable
8-bit software programmable prescaler
Internal or external clock select
Interrupt on overflow from FFh to 00h
Edge select for external clock
Figure 7-1 is a simplified block diagram of the Timer0
module.
Timer mode is selected by clearing the T0CS bit
(OPTION<5>). In Timer mode, the TMR0 will increment
every instruction cycle (without prescaler). If Timer0 is
written, the increment is inhibited for the following two
cycles (Figure 7-2 and Figure 7-3). The user can work
around this by writing an adjusted value to TMR0.
Counter mode is selected by setting the T0CS bit. In
this mode Timer0 will increment either on every rising
or falling edge of pin RA4/T0CKI. The incrementing
edge is determined by the source edge (T0SE) control
bit (OPTION<4>). Clearing the T0SE bit selects the
rising edge. Restrictions on the external clock input are
discussed in detail in Section 7.2.
The prescaler is shared between the Timer0 module
and the Watchdog Timer. The prescaler assignment is
controlled
in
software
by
the
control
bit
PSA
(OPTION<3>). Clearing the PSA bit will assign the
prescaler to Timer0. The prescaler is not readable or
writable. When the prescaler is assigned to the Timer0
module, prescale value of 1:2, 1:4, ..., 1:256 are
selectable. Section 7.3 details the operation of the
prescaler.
7.1
TIMER0 Interrupt
Timer0 interrupt is generated when the TMR0 register
timer/counter overflows from FFh to 00h. This overflow
sets the T0IF bit. The interrupt can be masked by
clearing the T0IE bit (INTCON<5>). The T0IF bit
(INTCON<2>) must be cleared in software by the
Timer0 module interrupt service routine before re-
enabling this interrupt. The Timer0 interrupt cannot
wake the processor from SLEEP since the timer is shut
off during SLEEP. See Figure 7-4 for Timer0 interrupt
timing.
FIGURE 7-1:
TIMER0 BLOCK DIAGRAM
FIGURE 7-2:
TIMER0 (TMR0) TIMING: INTERNAL CLOCK/NO PRESCALER
Note
1: Bits, T0SE, T0CS, PS2, PS1, PS0 and PSA are located in the OPTION register.
2: The prescaler is shared with Watchdog Timer (Figure 7-6)
RA4/T0CKI
T0SE
0
1
0
pin
T0CS
F
OSC/4
Programmable
Prescaler
Sync with
Internal
clocks
TMR0
PSout
(2 Tcy delay)
PSout
Data bus
8
Set Flag bit T0IF
on Overflow
PSA
PS2: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
TMR0
PC
PC+1
PC+2
PC+3
PC+4
PC+5
PC+6
T0
T0+1
T0+2
NT0
NT0+1
NT0+2
T0
MOVWF TMR0
MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W
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
Instruction
Executed
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