参数资料
型号: PIC16CR76-I/SS
厂商: Microchip Technology
文件页数: 34/172页
文件大小: 0K
描述: IC PIC MCU 8KX14 28SSOP
标准包装: 47
系列: PIC® 16C
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 22
程序存储器容量: 14KB(8K x 14)
程序存储器类型: ROM
RAM 容量: 368 x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 5.5 V
数据转换器: A/D 5x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 管件
2007 Microchip Technology Inc.
DS39599G-page 127
PIC18F2220/2320/4220/4320
13.0 TIMER2 MODULE
The Timer2 module timer has the following features:
8-bit Timer register (TMR2)
8-bit Period register (PR2)
Readable and writable (both registers)
Software programmable prescaler (1:1, 1:4, 1:16)
Software programmable postscaler (1:1 to 1:16)
Interrupt on TMR2 match with PR2
MSSP module optional use of TMR2 output to
generate clock shift
Timer2 has a control register shown in Register 13-1.
TMR2 can be shut-off by clearing control bit, TMR2ON
(T2CON<2>),
to
minimize
power
consumption.
Figure 13-1 is a simplified block diagram of the Timer2
module. Register 13-1 shows the Timer2 Control regis-
ter. The prescaler and postscaler selection of Timer2
are controlled by this register.
13.1
Timer2 Operation
Timer2 can be used as the PWM time base for the
PWM mode of the CCP module. 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 out-
put of TMR2 goes through a 4-bit postscaler (which
gives a 1:1 to 1:16 scaling inclusive) to generate 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.
REGISTER 13-1:
T2CON: TIMER2 CONTROL REGISTER
U-0
R/W-0
TOUTPS3
TOUTPS2
TOUTPS1
TOUTPS0
TMR2ON
T2CKPS1
T2CKPS0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
Unimplemented: Read as ‘0’
bit 6-3
TOUTPS3:TOUTPS0: Timer2 Output Postscale Select bits
0000 = 1:1 Postscale
0001 = 1:2 Postscale
1111 = 1:16 Postscale
bit 2
TMR2ON: Timer2 On bit
1 = Timer2 is on
0 = Timer2 is off
bit 1-0
T2CKPS1:T2CKPS0: Timer2 Clock Prescale Select bits
00 = Prescaler is 1
01 = Prescaler is 4
1x = Prescaler is 16
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