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| 型號： | MX10EXAUI |
| 廠商： | MACRONIX INTERNATIONAL CO LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 30 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | 10 X 10 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, LQFP-44 |
| 文件頁數(shù)： | 17/55頁 |
| 文件大?。?/td> | 476K |
| 代理商： | MX10EXAUI |
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P/N:PM0625 Specifications subject to change without notice, contact your sales representatives for the most update information. REV. 1.0, JUL. 01, 2005
MX10EXA
New Enhanced Mode 0
For timers T0 or T1 the 13-bit count mode on the 80C51
(current Mode 0) has been replaced in the XA with a 16-
bit auto-reload mode. Four additional 8-bit data registers
(two per timer: RTHn and RTLn) are created to hold the
auto-reload values. In this mode, the TH overflow will set
the TF flag in the TCON register and cause both the TL
and TH counters to be loaded from the RTL and RTH
registers respectively.
These new SFRs will also be used to hold the TL reload
data in the 8-bit auto-reload mode (Mode 2) instead of
TH.
The overflow rate for Timer 0 or Timer 1 in Mode 0 may
be calculated as follows:
Timer_Rate = Osc/(N*(65536 - Timer_Reload_Value))
where N = the TCLK prescaler value: 4 (default), 16, or
64.
Mode 1
Mode 1 is the 16-bit non-auto reload mode.
Mode 2
Mode 2 configures the Timer register as an 8-bit Counter
(TLn) with automatic reload. Overflow from TLn not only
sets TFn, but also reloads TLn with the contents of RTLn,
which is preset by software. The reload leaves THn un-
changed.
Mode 2 operation is the same for Timer/Counter 0.
The overflow rate for Timer 0 or Timer 1 in Mode 2 may
be calculated as follows:
Timer_Rate = Osc/(N * (256 - Timer_Reload_Value))
where N = the TCLK prescaler value: 4, 16, or 64.
Mode 3
Timer 1 in Mode 3 simply holds its count. The effect is
the same as setting TR1 =0.
Timer 0 in Mode 3 establishes TL0 and TH0 as two sepa-
rate counters. TL0 uses the Timer 0 control bits: CIT;
GATE, TR0, INT0, and TF0. TH0 is locked into a timer
function and takes over the use of TR1 and TF1 from
Timer 1. Thus, TH0 now controls the "Timer 1" interrupt.
Mode 3 is provided for applications requiring an extra 8-
bit timer. When Timer 0 is in Mode 3, Timer 1 can be
turned on and off by switching it out of and into its own
Mode 3, or can still be used by the serial port as a baud
rate generator, or in fact, in any application not requiring
an interrupt.
TF1
TR1
TF0
TR0
IE1
MSB
LSB
IT1
IE0
IT0
Bit Addressable
Reset Value:00H
Address:410
TCON
BIT
SYMBOL FUNCTION
TCON.7
TF1
Timer 1 overflow flag. Set by hardware on Timer/Counter overflow.
This flag will not be set if T1OE(TSTAT.2) is set.
Cleared by hardware when processor vectors to interrupt routine, or by clearing the bit
in software.
TCON.6
TR1
Timer 1 Run control bit. Set/cleared by software to turn Timer/Counter 1 on/off.
TCON.5
TF0
Timer 0 overflow flag. Set by hardware on Timer/Counter overflow.
This flag will not be set if T0OE (TSTAT.0) is set.
Cleared by hardware when processor vectors to interrupt routine, or by clearing the bit
in software.
TCON.4
TR0
Timer 0 Run control bit. Set/cleared by software to turn Timer/Counter 0 on/off.
TCON.3
IE1
Interrupt 1 Edge flag. Set by hardware when external interrupt edge detected.
Cleared when interrupt processed.
TCON.2
IT1
Interrupt 1 type control bit. Set/cleared by software to specify falling edge/low level
triggered external interrupts.
TCON.2
IE0
Interrupt 0 Edge flag. Set by hardware when external interrupt edge detected.
Cleared when interrupt processed.
TCON.0
IT0
Interrupt 0 Type control bit. Set/cleared by software to specify falling edge/tow level
triggered external interrupts.
Figure 7. Timer/Counter(TCON) Register
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