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参数资料
| 型号： | ST6240BQ6/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | PLASTIC, QFP-80 |
| 文件页数： | 35/73页 |
| 文件大小： | 1963K |
| 代理商： | ST6240BQ6/XXX |
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ST62T40B/E40B
TIMER 1& 2 (Cont’d)
4.2.1 TIMER 1 Operating Modes
There are three operating modes, which are se-
lected by the TOUT and DOUT bits (see TSCR
register). These three modes correspond to the
two clocks which can be connected to the 7-bit
prescaler (fINT ÷ 12 or TIMER pin signal), and to
the output mode.
4.2.1.1 Gated Mode
(TOUT = “0”, DOUT = “1”)
In this mode the prescaler is decremented by the
Timer clock input (fINT ÷ 12), but ONLY when the
signal on the TIMER pin is held high (allowing
pulse width measurement). This mode is selected
by clearing the TOUT bit in the TSCR register to
“0” (i.e. as input) and setting the DOUT bit to “1”.
4.2.1.2 Event Counter Mode
(TOUT = “0”, DOUT = “0”)
In this mode, the TIMER pin is an input and the
prescaler is decremented on the rising edge.
4.2.1.3 Output Mode
(TOUT = “1”, DOUT = data out)
The TIMER pin is connected to the DOUT latch,
hence the Timer prescaler is clocked by the pres-
caler clock input (fINT ÷ 12).
The user can select the desired prescaler division
ratio through the PS2, PS1, PS0 bits. When the
TCR count reaches 0, it sets the TMZ bit in the
TSCR. The TMZ bit can be tested under program
control to perform a timer function whenever it
goes high. The low-to-high TMZ bit transition is
used to latch the DOUT bit of the TSCR and trans-
fer it to the TIMER pin. This operating mode allows
external signal generation on the TIMER pin.
Table 16. Timer Operating Modes
4.2.2 TIMER 2 Operating Mode
The Timer prescaler is clocked by the prescaler
clock input (fINT ÷ 12).
The user can select the desired prescaler division
ratio through the PS2, PS1, PS0 bits. When the
TCR count reaches 0, it sets the TMZ bit in the
TSCR. The TMZ bit can be tested under program
control to perform a timer function whenever it
goes high.
4.2.3 Timer Interrupt
When one of the counter registers decrements to
zero with the associated ETI (Enable Timer Inter-
rupt) bit set to one, an interrupt request is generat-
ed as described in Interrupt Chapter. When the
counter decrements to zero, the associated TMZ
bit in the TSCR register is set to one.
4.2.4 Application Notes
The user can select the presence of an on-chip
pull-up on the TIMER pin as option.
TMZ is set when the counter reaches zero; howev-
er, it may also be set by writing 00h in the TCR
register or by setting bit 7 of the TSCR register.
The TMZ bit must be cleared by user software
when servicing the timer interrupt to avoid unde-
sired interrupts when leaving the interrupt service
routine. After reset, the 8-bit counter register is
loaded with 0FFh, while the 7-bit prescaler is load-
ed with 07Fh, and the TSCR register is cleared.
This means that the Timer is stopped (PSI=“0”)
and the timer interrupt is disabled.
A write to the TCR register will predominate over
the 8-bit counter decrement to 00h function, i.e. if a
write and a TCR register decrement to 00h occur
simultaneously, the write will take precedence,
and the TMZ bit is not set until the 8-bit counter
reaches 00h again. The values of the TCR and the
PSC registers can be read accurately at any time.
TOUT
DOUT
Timer Pin
Timer Function
0
Input
Event Counter
0
1
Input
Gated Input
1
0
Output
Output “0”
1
Output
Output “1”
40
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相关代理商/技术参数 |
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| ST6240-P/QFP | 功能描述:插座和适配器 ST62 P/QFP Adaptor RoHS:否 制造商:Silicon Labs 产品:Adapter 用于:EM35x |
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| ST6242 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCU WITH LCD DRIVER, EEPROM AND A/D CONVERTER |
| ST6242B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-BIT MICROCONTROLLER ( MCU ) WITH OTP. ROM. FASTROM. EPROM. LCD DRIVER. EEPROM. A/D CONVERTER AND 64 PINS |
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