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参数资料
| 型号： | ST6265C |
| 英文描述： | 8-BIT MICROCONTROLLER ( MCU ) WITH OTP. ROM. FASTROM. EPROM. A/D CONVERTER. SAFE RESET. AUTO-RELOAD TIMER. EEPROM AND SPI |
| 中文描述： | 8位微控制器（MCU）的与检察官办公室。光盘。 FASTROM。存储器。的A / D转换器。安全复位。自动重加载定时器。的EEPROM和SPI |
| 文件页数： | 43/84页 |
| 文件大小： | 918K |
| 代理商： | ST6265C |
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ST62T53C/T60C/T63C ST62E60C
4.2 TIMER
The MCU features an on-chip Timer peripheral,
consisting of an 8-bit counter with a 7-bit program-
mable prescaler, giving a maximum count of 2
15
.
Figure 26
shows the Timer Block Diagram. The
content of the 8-bit counter can be read/written in
the Timer/Counter register, TCR, which can be ad-
dressed in Data space as a RAM location at ad-
dress 0D3h. The state of the 7-bit prescaler can be
read in the PSC register at address 0D2h. The
control logic device is managed in the TSCR reg-
ister as described in the following paragraphs.
The 8-bit counter is decrement by the output (ris-
ing edge) coming from the 7-bit prescaler and can
be loaded and read under program control. When
it decrements to zero then the TMZ (Timer Zero)bit
in the TSCR is set. If the ETI (Enable Timer Inter-
rupt) bit in the TSCR is also set, an interrupt re-
quest is generated. The Timer interrupt can be
used to exit the MCU from WAIT mode.
The prescaler input is the internal frequency (f
INT
)
divided by 12. The prescaler decrements on the
rising edge. Depending on the division factor pro-
grammed by PS2, PS1 and PS0 bits in the TSCR
(see
Figure 12
), the clock input of the timer/coun-
ter register is multiplexed to different sources. For
division factor 1, the clock input of the prescaler is
also that of timer/counter; for factor 2, bit 0 of the
prescaler register is connected to the clock input of
TCR. This bit changes its state at half the frequen-
cy of the prescaler input clock. For factor 4, bit 1 of
the PSC is connected to the clock input of TCR,
and so forth. The prescaler initialize bit, PSI, in the
TSCR register must be set to allow the prescaler
(and hence the counter) to start. If it is cleared, all
the prescaler bits are set and the counter is inhib-
ited from counting. The prescaler can be loaded
with any value between 0 and 7Fh, if bit PSI is set.
The prescaler tap is selected by means of the
PS2/PS1/PS0 bits in the control register.
Figure 27
illustrates the Timer’s working principle.
Figure 26. Timer Block Diagram
DATA BUS
8-BIT
COUNTER
STATUS/CONTROL
REGISTER
INTERRUPT
LINE
VR02070A
3
8
8
8
6
5
4
3
2
1
0
SELECT
1 OF 7
12
b7 b6
b5
b4
b3
b2
b1
b0
TMZ ETI D5
D4 PSI PS2 PS1 PS0
f
INT
PSC
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ST626X | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8/16-Bit Micros |
| ST626XC-KIT | 制造商:STMicroelectronics 功能描述:ST625X, 6X KIT - Bulk |
| ST626XC-KIT/EU | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:DEVELOPMENT KIT ST626 EURO |
| ST626XC-KIT/UK | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:ST62 KIT |
| ST626XC-KIT/US | 功能描述:开发板和工具包 - 其他处理器 ST626X Starter Kit RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压: |
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