參數(shù)資料
型號(hào): AT89LP214-20XU
廠商: Atmel
文件頁數(shù): 24/98頁
文件大?。?/td> 0K
描述: MCU 8051 2K FLASH 20MHZ 14-TSSOP
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 95
系列: 89LP
核心處理器: 8051
芯體尺寸: 8-位
速度: 20MHz
連通性: SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 12
程序存儲(chǔ)器容量: 2KB(2K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 128 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: 14-TSSOP(0.173",4.40mm 寬)
包裝: 管件
30
3538E–MICRO–11/10
AT89LP213/214
14.2
Mode 1 – 16-bit Auto-Reload Timer/Counter
In Mode 1 the Timers are configured for 16-bit auto-reload. The Timer register is run with all
16 bits. The 16-bit reload value is stored in the high and low reload registers (RH1/RL1). 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 timer register is reloaded with the value from RH1/RL1 and the
overflow flag bit in TCON is set. See Figure 14-2. The reload registers default to 0000H, which
gives the full 16-bit timer period compatible with the standard 8051. Mode 1 operation is the
same for Timer/Counter 0.
Figure 14-2. Timer/Counter 1 Mode 1: 16-bit Auto-reload
14.3
Mode 2 – 8-bit Auto-reload Timer/Counter
Mode 2 configures the Timer register as an 8-bit Counter (TL1) with automatic reload, as shown
in Figure 14-3. Overflow from TL1 not only sets TF1, but also reloads TL1 with the contents of
TH1, which is preset by software. The reload leaves TH1 unchanged. Mode 2 operation is the
same for Timer/Counter 0.
Figure 14-3. Timer/Counter 1 Mode 2: 8-bit Auto-reload
Note:
RH1/RL1 are not required by Timer 1 during Mode 2 and may be used as temporary storage
registers.
Mode 1:
Time-out Period
65536
RH0 RL0
{,
}
()
Oscillator Frequency
---------------------------------------------------------
TPS
1
+
()
×
=
OSC
T1 Pin
TR1
GATE
INT1 Pin
TL1
(8 Bits)
Control
Interrupt
C/T = 0
C/T =1
TH1
(8 Bits)
TF1
RL1
(8 Bits)
RH1
(8 Bits)
Reload
÷TPS
Mode 2:
Time-out Period
256
TH0
()
Oscillator Frequency
-------------------------------------------------------
TPS
1
+
()
×
=
OSC
T1 Pin
TR1
GATE
TF1
TL1
(8 Bits)
TH1
(8 Bits)
Control
Reload
Interrupt
INT0 Pin
C/T = 0
C/T = 1
÷TPS
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