收藏本站
71M6543F/71M6543G Data Sheet
Table 20: PCON Register Bit Description ( SFR 0x87 )
Bit
PCON[7]
Symbol
SMOD
Function
The SMOD bit doubles the baud rate when set
2.4.6
Timers and Counters
The 80515 has two 16-bit timer/counter registers: Timer 0 and Timer 1. These registers can be configured
for counter or timer operations.
In timer mode, the register is incremented every machine cycle, i.e. it counts up once for every 12 periods of
the MPU clock. In counter mode, the register is incremented when the falling edge is observed at the
corresponding input signal T0 or T1 (T0 and T1 are the timer gating inputs derived from certain DIO pins, see
2.5.10 Digital I/O ). Since it takes 2 machine cycles to recognize a 1-to-0 event, the maximum input count rate
is 1/2 of the clock frequency (CKMPU). There are no restrictions on the duty cycle, however to ensure proper
recognition of the 0 or 1 state, an input should be stable for at least 1 machine cycle.
Four operating modes can be selected for Timer 0 and Timer 1, as shown in Table 21 and Table 22 . The
TMOD ( SFR 0x89 ) register, shown in
Table 23, is used to select the appropriate mode. The timer/counter operation is controlled by the TCON
( SFR 0x88 ) register, which is shown in Table 24 . Bits TR1 ( TCON[6] ) and TR0 ( TCON[4] ) in the TCON
register start their associated timers when set.
Table 21: Timers/Counters Mode Description
M1
0
0
1
1
M0
0
1
0
1
Mode
Mode 0
Mode 1
Mode 2
Mode 3
Function
13-bit Counter/Timer mode with 5 lower bits in the TL0 or TL1 ( SFR
0x8A or SFR 0x8B ) register and the remaining 8 bits in the TH0 or TH1
( SFR 0x8C or SFR 0x8D ) register (for Timer 0 and Timer 1, respectively).
The 3 high order bits of TL0 and TL1 are held at zero.
16-bit Counter/Timer mode.
8-bit auto-reload Counter/Timer. The reload value is kept in TH0 or
TH1 , while TL0 or TL1 is incremented every machine cycle. When
TL( x) overflows, a value from TH( x) is copied to TL (x) (where x is 0 for
counter/timer 0 or 1 for counter/timer 1.
If Timer 1 M1 and M0 bits are set to 1, Timer 1 stops.
If Timer 0 M1 and M0 bits are set to 1, Timer 0 acts as two independent
8-bit Timer/Counters.
In Mode 3, TL0 is affected by TR0 and gate control bits, and sets the TF0 flag on overflow, while TH0
is affected by the TR1 bit, and the TF1 flag is set on overflow.
Table 22 specifies the combinations of operation modes allowed for Timer 0 and Timer 1.
Table 22: Allowed Timer/Counter Mode Combinations
Timer 1
Mode 0
Mode 1
Mode 2
38
Timer 0 - mode 0
Timer 0 - mode 1
Timer 0 - mode 2
Yes
Yes
Not allowed
Yes
Yes
Not allowed
Yes
Yes
Yes
v2
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
71M6545-IGT/F IC ENERGY METERING
720-10007-00300 CBL D-SUB 9PIN FMAL-25PIN FML 3M
720-10010-00025 CBL DSUB 9PIN FML-25PIN MAL .25M
720-10020-00300 CBL DSUB 9PIN FML-9PIN MALE 3M
720-10021-00300 CBL DSUB 9PIN FML-9PIN FEMAL 3M
72231-0881 8 POS T/P SHLD 4 GR ASSY
7250B PANEL KIT BOTTOM FOR R-1220 CASE
731-10061-00200 CBL DSUB HD 15FEMAL-15MALE 2.0M
相关代理商/技术参数
71M6543F-IGTR/F 功能描述:计量片上系统 - SoC Precision Energy Meter IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel
71M6543FT-IGT/F 制造商:Maxim Integrated Products 功能描述:ENERGY METER ICS - Rail/Tube
71M6543FT-IGTR/F 制造商:Maxim Integrated Products 功能描述:3-PHASE SOC, 64KB FLASH, PRES TEMP SENSOR - Tape and Reel
71M6543G 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation
71M6543GH 制造商:未知厂家 制造商全称:未知厂家 功能描述:电表IC
71M6543GHT-IGT/F 制造商:Maxim Integrated Products 功能描述:3-PHASE, 128KB, PRES TEMP SENSOR, HI PREC - Bulk
71M6543GHT-IGTR/F 制造商:Maxim Integrated Products 功能描述:3-PHASE, 128KB, PRES TEMP SENSOR, HI PREC - Tape and Reel
71M6543G-IGT/F 功能描述:计量片上系统 - SoC Precision Energy Meter IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel