參數(shù)資料
型號: 935225410112
廠商: NXP SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PDIP40
封裝: 0.600 INCH, PLASTIC, DIP-40
文件頁數(shù): 13/67頁
文件大?。?/td> 400K
代理商: 935225410112
1998 Apr 07
20
Philips Semiconductors
Product specication
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
Timer TL0; TL1 serves as 5-bit prescaler.
0
1
16-bit Timer/Counter TH0; TH1 and TL0; TL1 are cascaded; there is no prescaler.
1
0
8-bit auto-reload Timer/Counter TH0; TH1 holds a value which is to be reloaded into
TL0; TL1 each time it overows.
1
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.
1
Timer 1: Timer/Counter 1 stopped.
76543210
TF1
TR1
TF0
TR0
IE1
IT1
IE0
IT0
BIT
SYMBOL
DESCRIPTION
7 and 5
TF1 and TF0 Timer 1 and Timer 0 overow ags. Set by hardware on Timer/Counter overow.
Cleared by hardware when processor vectors to interrupt routine.
6 and 4
TR1 and TR0 Timer 1 and Timer 0 run control bits. Set/cleared by software to turn Timer/Counter
on/off.
3 and 1
IE1 and IE0
Interrupt 1 and Interrupt 0 edge ags. Set by hardware when external interrupt edge
detected. Cleared when interrupt processed.
2 and 0
IT1 and IT0
Interrupt 1 and Interrupt 0 type control bits. Set/cleared by software to specify falling
edge/LOW level triggered external interrupts.
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