TS80C54/58X2 is compatible with the timer 2 i" />
參數(shù)資料
型號(hào)： TS87C54X2-MIA
廠商： Atmel
文件頁(yè)數(shù)： 6/62頁(yè)
文件大?。?/td> 0K
描述： IC MCU 8BIT 16K OTP 40MHZ 40-DIP
標(biāo)準(zhǔn)包裝： 9
系列： 87C
核心處理器： 8051
芯體尺寸： 8-位
速度： 40/20MHz
連通性： UART/USART
外圍設(shè)備： POR，WDT
輸入/輸出數(shù)： 32
程序存儲(chǔ)器容量： 16KB（16K x 8）
程序存儲(chǔ)器類型： OTP
RAM 容量： 256 x 8
電壓 - 電源 (Vcc/Vdd)： 4.5 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
14
4431E–8051–04/06
AT/TS8xC54/8X2
8.
Timer 2
The timer 2 in the
TS80C54/58X2 is compatible with the timer 2 in the 80C52.
It is a 16-bit timer/counter: the count is maintained by two eight-bit timer registers, TH2 and TL2,
connected in cascade. It is controlled by T2CON register (See Table 8-1) and T2MOD register
(See Table 8-2). Timer 2 operation is similar to Timer 0 and Timer 1. C/T2 selects F
OSC/12 (timer
operation) or external pin T2 (counter operation) as the timer clock input. Setting TR2 allows TL2
to be incremented by the selected input.
Timer 2 has 3 operating modes: capture, autoreload and Baud Rate Generator. These modes
are selected by the combination of RCLK, TCLK and CP/RL2 (T2CON), as described in the
Atmel Wireless & Microcontrollers 8-bit Microcontroller Hardware description.
Refer to the Atmel Wireless & Microcontrollers 8-bit Microcontroller Hardware description for the
description of Capture and Baud Rate Generator Modes.
In
TS80C54/58X2 Timer 2 includes the following enhancements:
Auto-reload mode with up or down counter
Programmable clock-output
8.1
Auto-Reload Mode
The auto-reload mode configures timer 2 as a 16-bit timer or event counter with automatic
reload. If DCEN bit in T2MOD is cleared, timer 2 behaves as in 80C52 (refer to the Atmel Wire-
less & Microcontrollers 8-bit Microcontroller Hardware description). If DCEN bit is set, timer 2
acts as an Up/down timer/counter as shown in Figure 8-1. In this mode the T2EX pin controls
the direction of count.
When T2EX is high, timer 2 counts up. Timer overflow occurs at FFFFh which sets the TF2 flag
and generates an interrupt request. The overflow also causes the 16-bit value in RCAP2H and
RCAP2L registers to be loaded into the timer registers TH2 and TL2.
When T2EX is low, timer 2 counts down. Timer underflow occurs when the count in the timer
registers TH2 and TL2 equals the value stored in RCAP2H and RCAP2L registers. The under-
flow sets TF2 flag and reloads FFFFh into the timer registers.
The EXF2 bit toggles when timer 2 overflows or underflows according to the the direction of the
count. EXF2 does not generate any interrupt. This bit can be used to provide 17-bit resolution
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