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| 型号： | ST7SCR1R4T1 |
| 厂商： | 意法半导体 |
| 英文描述： | Enclosures; External Depth:18.50"; External Height:47.312"; External Width:22"; Panel Width:19.00"; Enclosure Color:Royal Blue; Enclosure Material:Steel; Panel Space:42.00" RoHS Compliant: Yes |
| 中文描述： | 8位低功耗，全速USB微控制器与16K的闪存，768内存，智能卡的I /楼，计时器 |
| 文件页数： | 42/102页 |
| 文件大小： | 1413K |
| 代理商： | ST7SCR1R4T1 |
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ST7SCR
42/102
12.2 TIME BASE UNIT (TBU)
12.2.1 Introduction
The Timebase unit (TBU) can be used to generate
periodic interrupts.
12.2.2 Main Features
I
8-bit upcounter
I
Programmable prescaler
I
Period between interrupts: max. 8.1ms (at 8
MHz f
CPU
)
I
Maskable interrupt
12.2.3 Functional Description
The TBU operates as a free-running upcounter.
When the TCEN bit in the TBUCSR register is set
by software, counting starts at the current value of
the TBUCV register. The TBUCV register is incre-
mented at the clock rate output from the prescaler
selected by programming the PR[2:0] bits in the
TBUCSR register.
When the counter rolls over from FFh to 00h, the
OVF bit is set and an interrupt request is generat-
ed if ITE is set.
The user can write a value at any time in the
TBUCV register.
12.2.4 Programming Example
In this example, timer is required to generate an in-
terrupt after a delay of 1 ms.
Assuming that f
CPU
is 8 MHz and a prescaler divi-
sion factor of 256 will be programmed using the
PR[2:0] bits in the TBUCSR register, 1 ms = 32
TBU timer ticks.
In this case, the initial value to be loaded in the
TBUCV must be (256-32) = 224 (E0h).
ld A, E0h
ld TBUCV, A ; Initialize counter value
ld A 1Fh
;
ld TBUCSR, A ; Prescaler factor = 256,
; interrupt enable,
; TBU enable
Figure 26. TBU Block Diagram
TBU 8-BIT UPCOUNTER (TBUCV REGISTER)
INTERRUPT REQUEST
TBU PRESCALER
f
CPU
TBUCSR REGISTER
PR1
PR0
PR2
TCEN
ITE
OVF
MSB
LSB
0
0
1
TBU
0
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ST7SCRDIE | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:ST7SCR - 8-BIT LOW-POWER. FULL-SPEED USB MCU WITH 16K FLASH. 768 RAM. SMARTCARD I/F. TIMER (DATA BRIEFING) |
| ST7-STICK | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Low Cost, In-Circuit Programmer for ST7 |
| ST7-STICK/US | 功能描述:程序设计器 - 基于处理器 ST7 In-Circuit Comm RoHS:否 制造商:Olimex Ltd. 产品:Programmers 工具用于评估:XMEGA, MegaAVR, tinyAVR 核心:AVR 接口类型:USB 工作电源电压:1.8 V to 5.5 V |
| ST7-STICK45 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-bit microcontroller with single voltage Flash memory, data EEPROM, ADC, timers, SPI |
| ST7SUPERLITE | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI |
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