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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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TS80C51RA2-VCKB Folha de dados(PDF) 48 Page - ATMEL Corporation |
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TS80C51RA2-VCKB Folha de dados(HTML) 48 Page - ATMEL Corporation |
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48 / 74 page  48 Rev. C - 06 March, 2001 TS80C51RA2/RD2 TS83C51RB2/RC2/RD2 TS87C51RB2/RC2/RD2 6.11. ONCETM Mode (ON Chip Emulation) The ONCE mode facilitates testing and debugging of systems using TS80C51Rx2 without removing the circuit from the board. The ONCE mode is invoked by driving certain pins of the TS80C51Rx2; the following sequence must be exercised: • Pull ALE low while the device is in reset (RST high) and PSEN is high. • Hold ALE low as RST is deactivated. While the TS80C51Rx2 is in ONCE mode, an emulator or test CPU can be used to drive the circuit Table 26. shows the status of the port pins during ONCE mode. Normal operation is restored when normal reset is applied. Table 25. External Pin Status during ONCE Mode ALE PSEN Port 0 Port 1 Port 2 Port 3 XTAL1/2 Weak pull-up Weak pull-up Float Weak pull-up Weak pull-up Weak pull-up Active |
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