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| 型號(hào)： | 73S1209F-68IMR/F |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, QCC68 |
| 封裝： | LEAD FREE, QFN-68 |
| 文件頁(yè)數(shù)： | 63/123頁(yè) |
| 文件大?。?/td> | 1385K |
| 代理商： | 73S1209F-68IMR/F |
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73S1209F Data Sheet
DS_1209F_004
1.7.5 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, meaning that it counts up after every 12
periods of the MPU clock signal.
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 USR[0:7] pins, see the User (USR)
Ports section). Since it takes 2 machine cycles to recognize a 1-to-0 event, the maximum input count
rate is 1/2 of the oscillator frequency. There are no restrictions on the duty cycle, however to ensure
proper recognition of 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. Two Special Function Registers (TMOD
and TCON) are used to select the appropriate mode.
The Timer 0 load registers are designated as TL0 and TH0 and the Timer 1 load registers are designated
Timer/Counter Mode Control Register (TMOD): 0x89
0x00
Table 40: The TMOD Register
MSB
LSB
GATE
C/T
M1
M0
GATE
C/T
M1
M0
Timer 1
Timer 0
Bits TR1 and TR0 in the TCON register start their associated timers when set.
Table 41: TMOD Register Bit Description
Bit
Symbol
Function
TMOD.7
TMOD.3
Gate
If set, enables external gate control (USR pin(s) connected to T0 or T1
for Counter 0 or 1, respectively). When T0 or T1 is high, and TRx bit is
set (see the TCON register), a counter is incremented every falling edge
on T0 or T1 input pin. If not set, the TRx bit controls the corresponding
timer.
TMOD.6
TMOD.2
C/T
Selects Timer or Counter operation. When set to 1, the counter
operation is performed based on the falling edge of T0 or T1. When
cleared to 0, the corresponding register will function as a timer.
TMOD.5
TMOD.1
M1
Selects the mode for Timer/Counter 0 or Timer/Counter 1, as shown in
the TMOD description.
TMOD.4
TMOD.0
M0
Selects the mode for Timer/Counter 0 or Timer/Counter 1, as shown in
the TMOD description.
44
Rev. 1.2
相關(guān)PDF資料 |
PDF描述 |
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| 73S1209F-44IMR/F | POWER SUPPLY MANAGEMENT CKT, QCC44 |
| 73S1209F-68IMR/F | POWER SUPPLY MANAGEMENT CKT, QCC68 |
| 73S1209F-68IM/F | POWER SUPPLY MANAGEMENT CKT, QCC68 |
| 73S1209F-44IMR/F | POWER SUPPLY MANAGEMENT CKT, QCC44 |
| 73S1209F-44IM/F | POWER SUPPLY MANAGEMENT CKT, QCC44 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 73S1209F-68M/F/P1 | 功能描述:8位微控制器 -MCU Contained 80515-SoC Serial Hst Interface RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| 73S1209F-EB | 功能描述:開(kāi)發(fā)板和工具包 - 8051 73S1209F Eval Brd (Doc. Cd, Cable) RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評(píng)估:C8051F960, Si7005 核心: 接口類型:USB 工作電源電壓: |
| 73S1209F-IM44 DK | 制造商:Maxim Integrated Products 功能描述:Development Boards & Kits - 8051 73S1209F Dev Kit Eval Bd Ice Cable Cd |
| 73S1209F-IM44 EB | 制造商:Maxim Integrated Products 功能描述:Development Boards & Kits - 8051 73S1209F Eval Brd Eval Bd Doc Cd Cable |
| 73S1209F-IM68 DK | 制造商:Maxim Integrated Products 功能描述:Development Boards & Kits - 8051 73S1209F Dev Kit Eval Bd Ice Cable Cd |
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