參數(shù)資料
型號: AT89LP52-20PU
廠商: Atmel
文件頁數(shù): 60/117頁
文件大小: 0K
描述: IC MCU 8051 8K FLASH SPI 40PDIP
標準包裝: 10
系列: 89LP
核心處理器: 8051
芯體尺寸: 8-位
速度: 20MHz
連通性: EBI/EMI,I²C,SPI,UART/USART
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 36
程序存儲器容量: 8KB(8K x 8)
程序存儲器類型: 閃存
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 2.4 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 40-DIP(0.600",15.24mm)
包裝: 管件
47
3709D–MICRO–12/11
AT89LP51/52
11.1
Mode 0 – 13-bit Timer/Counter
Both Timers in Mode 0 are 8-bit Counters with a divide-by-32 prescaler. Figure 11-1 shows the
Mode 0 operation as it applies to Timer 1. As the count rolls over from all “1”s to all “0”s, it sets
the Timer interrupt flag TF1. The counter input is enabled to the Timer when TR1 = 1 and either
GATE1 = 0 or INT1 =1. Setting GATE1 = 1 allows the Timer to be controlled by external input
INT1, to facilitate pulse width measurements. TR1 is a control bit in the Special Function Regis-
ter TCON. GATE1 is in TMOD. The 13-bit register consists of all 8 bits of TH1 and the lower 5
bits of TL1. The upper 3 bits of TL1 are indeterminate and should be ignored. Setting the run flag
(TR1) does not clear the registers.
Figure 11-1. Timer/Counter 1 Mode 0: 13-bit Counter
Mode 0 operation is the same for Timer 0 as for Timer 1, except that TR0, TF0, GATE0 and
INT0 replace the corresponding Timer 1 signals in Figure 11-1. There are two different C/T bits,
one for Timer 1 (TMOD.6) and one for Timer 0 (TMOD.2).
11.2
Mode 1 – 16-bit Timer/Counter
In Mode 1 the Timers are configured for 16-bit operation. The Timer register is run with all 16 bits
and the clock is applied to the combined high and low timer registers (TH1/TL1). As clock pulses
are received, the timer counts up: 0000H, 0001H, 0002H, etc. An overflow occurs on the
FFFFH-to-0000H transition, upon which the overflow flag bit in TCON is set. See Figure 11-2.
Mode 1 operation is the same for Timer/Counter 0.
Figure 11-2. Timer/Counter 1 Mode 1: 16-bit Counter
Mode 0:
Time-out Period
8192
System Frequency
--------------------------------------------------
TPS
1
+
()
×
=
OSC
T1 Pin
TR1
GATE1
INT1 Pin
TL1
(5 Bits)
Control
Interrupt
C/T = 0
C/T = 1
TH1
(8 Bits)
TF1
÷CDV
÷TPS
Mode 1:
Time-out Period
65536
System Frequency
--------------------------------------------------
TPS
1
+
()
×
=
OSC
T1 Pin
TR1
GATE1
INT1 Pin
TL1
(8 Bits)
Control
Interrupt
C/T = 0
C/T =1
TH1
(8 Bits)
TF1
÷CDV
÷TPS
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