參數(shù)資料
型號: PIC16C72A-20I/SP
廠商: Microchip Technology
文件頁數(shù): 47/120頁
文件大?。?/td> 0K
描述: IC MCU OTP 2KX14 A/D PWM 28DIP
產(chǎn)品培訓模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標準包裝: 15
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,SPI
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 22
程序存儲器容量: 3.5KB(2K x 14)
程序存儲器類型: OTP
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 4 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 5x8b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-DIP(0.300",7.62mm)
包裝: 管件
PIC16C62B/72A
DS35008B-page 32
Preliminary
1999 Microchip Technology Inc.
6.1
Timer2 Operation
The Timer2 output is also used by the CCP module to
generate the PWM "On-Time", and the PWM period
with a match with PR2.
The TMR2 register is readable and writable, and is
cleared on any device reset.
The input clock (FOSC/4) has a prescale option of 1:1,
1:4
or
1:16,
selected
by
control
bits
T2CKPS1:T2CKPS0 (T2CON<1:0>).
The match output of TMR2 goes through a 4-bit
postscaler (which gives a 1:1 to 1:16 scaling) to gener-
ate a TMR2 interrupt (latched in flag bit TMR2IF,
(PIR1<1>)).
The prescaler and postscaler counters are cleared
when any of the following occurs:
a write to the TMR2 register
a write to the T2CON register
any device reset (Power-on Reset, MCLR reset,
Watchdog Timer reset or Brown-out Reset)
TMR2 is not cleared when T2CON is written.
6.2
Timer2 Interrupt
The Timer2 module has an 8-bit period register PR2.
Timer2 increments from 00h until it matches PR2 and
then resets to 00h on the next increment cycle. PR2 is
a readable and writable register. The PR2 register is ini-
tialized to FFh upon reset.
6.3
Output of TMR2
The output of TMR2 (before the postscaler) is fed to the
Synchronous Serial Port module, which optionally uses
it to generate shift clock.
TABLE 6-1
REGISTERS ASSOCIATED WITH TIMER2 AS A TIMER/COUNTER
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR,
BOR
Value on
all other
resets
0Bh,8Bh
INTCON
GIE
PEIE
T0IE
INTE
RBIE
T0IF
INTF
RBIF
0000 000x
0000 000u
0Ch
PIR1
ADIF
SSPIF
CCP1IF
TMR2IF
TMR1IF
-00- 0000
0000 0000
8Ch
PIE1
ADIE
SSPIE
CCP1IE
TMR2IE
TMR1IE
-0-- 0000
0000 0000
11h
TMR2
Timer2 module’s register
0000 0000
12h
T2CON
TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0
TMR2ON
T2CKPS1
T2CKPS0
-000 0000
92h
PR2
Timer2 Period Register
1111 1111
Legend:
x
= unknown, u = unchanged, - = unimplemented read as '0'. Shaded cells are not used by the Timer2 module.
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