參數資料
型號: PIC16C505T-20I/SL
廠商: Microchip Technology
文件頁數: 16/90頁
文件大?。?/td> 0K
描述: IC MCU OTP 1KX12 14SOIC
產品培訓模塊: Asynchronous Stimulus
標準包裝: 2,600
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
外圍設備: POR,WDT
輸入/輸出數: 11
程序存儲器容量: 1.5KB(1K x 12)
程序存儲器類型: OTP
RAM 容量: 72 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 14-SOIC(0.154",3.90mm 寬)
包裝: 帶卷 (TR)
配用: 309-1086-ND - ADAPTER 14-ZIF BD W/14-SO PLUGS
309-1085-ND - ADAPTER 14-DIP BD W/2 14-SO PLUG
309-1001-ND - ADAPTER 14-SOIC TO 14-DIP
309-1000-ND - ADAPTER 14-SOIC TO 14-DIP
1999-2012 Microchip Technology Inc.
DS40192D-page 23
PIC16C505
6.0
TIMER0 MODULE AND TMR0
REGISTER
The Timer0 module has the following features:
8-bit timer/counter register, TMR0
- Readable and writable
8-bit software programmable prescaler
Internal or external clock select
- Edge select for external clock
Figure 6-1 is a simplified block diagram of the Timer0
module.
Timer mode is selected by clearing the T0CS bit
(OPTION<5>). In timer mode, the Timer0 module will
increment every instruction cycle (without prescaler). If
TMR0 register is written, the increment is inhibited for
the following two cycles (Figure 6-2 and Figure 6-3).
The user can work around this by writing an adjusted
value to the TMR0 register.
Counter mode is selected by setting the T0CS bit
(OPTION<5>). In this mode, Timer0 will increment
either on every rising or falling edge of pin T0CKI. The
T0SE bit (OPTION<4>) determines the source edge.
Clearing the T0SE bit selects the rising edge.
Restrictions on the external clock input are discussed
in detail in Section 6.1.
The prescaler may be used by either the Timer0
module or the Watchdog Timer, but not both. 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 values of 1:2,
1:4,..., 1:256 are selectable. Section 6.2 details the
operation of the prescaler.
A summary of registers associated with the Timer0
module is found in Table 6-1.
FIGURE 6-1:
TIMER0 BLOCK DIAGRAM
Note 1: Bits T0CS, T0SE, PSA, PS2, PS1 and PS0 are located in the OPTION register.
2: The prescaler is shared with the Watchdog Timer (Figure 6-5).
0
1
0
T0CS(1)
FOSC/4
Programmable
Prescaler(2)
Sync with
Internal
Clocks
TMR0 reg
PSout
(2 TCY delay)
PSout
Data Bus
8
PSA(1)
PS2, PS1, PS0(1)
3
Sync
T0SE
RC5/T0CKI
Pin
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