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參數(shù)資料
| 型號： | P89C739ABB |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-bit Flash microcontrollers |
| 中文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | 14 X 20 MM, 2.70 MM HEIGHT, PLASTIC, SOT-319-1, QFP-64 |
| 文件頁數(shù)： | 20/64頁 |
| 文件大?。?/td> | 360K |
| 代理商： | P89C739ABB |
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1998 Apr 07
20
Philips Semiconductors
Product specification
8-bit Flash microcontrollers
P89C738; P89C739
Table 11
Timer 0; Timer 1 mode select
10.1.2
Timer/Counter Control Register (TCON)
Table 12
Timer/Counter Control Register (SFR address 88H)
Table 13
Description of TCON bits
M1
M0
OPERATING
0
0
1
0
1
0
Timer TL0; TL1 serves as 5-bit prescaler.
16-bit Timer/Counter TH0; TH1 and TL0; TL1 are cascaded; there is no prescaler.
8-bit auto-reload Timer/Counter TH0; TH1 holds a value which is to be reloaded into
TL0; TL1 each time it overflows.
Timer 0: TL0 is an 8-bit Timer/Counter controlled by the standard Timer 0 control bits.
TH0 is an 8-bit timer only controlled by Timer 1 control bits.
Timer 1: Timer/Counter 1 stopped.
1
1
1
1
7
6
5
4
3
2
1
0
TF1
TR1
TF0
TR0
IE1
IT1
IE0
IT0
BIT
SYMBOL
DESCRIPTION
7 and 5
TF1 and TF0
Timer 1 and Timer 0 overflow flags
. Set by hardware on Timer/Counter overflow.
Cleared by hardware when processor vectors to interrupt routine.
TR1 and TR0
Timer 1 and Timer 0 run control bits.
Set/cleared by software to turn Timer/Counter
on/off.
IE1 and IE0
Interrupt 1 and Interrupt 0 edge flags
. Set by hardware when external interrupt edge
detected. Cleared when interrupt processed.
IT1 and IT0
Interrupt 1 and Interrupt 0 type control bits
. Set/cleared by software to specify falling
edge/LOW level triggered external interrupts.
6 and 4
3 and 1
2 and 0
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