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XR68C192 Datasheet(PDF) 4 Page - Exar Corporation |
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XR68C192 Datasheet(HTML) 4 Page - Exar Corporation |
4 / 33 page XR68C92/192 4 Rev. 1.33 SYMBOL DESCRIPTION (* 44 pin LQFP) -RESET 38 34 32 I Master Reset (active low). A low on this pin will reset all the outputs and internal registers. The transmitter output and the receiver input will be disabled during reset time. A0-A3 2,4, 1,3, 40,42, 6,7 5,6 44,1 I Address select lines. To select internal registers. -IACK 41 37 35 I Interrupt acknowledge (active low). A low on this pin indicates that the CPU has received an interrupt. If not used, this pin should be tied to VCC. -DACK 10 9 4 O Data Transfer Acknowledge ( three-state active low output). A low on this pin indicates proper transfer of data between the CPU and XR68C92/192 during read, write and interrupt cycles. -CS 39 35 33 I Chip select (active low). A low at this pin enables the data bus transfer operation. D0-D7 28,18 25,16 22,12 Bi-directional data bus. Eight bit, three state data bus to 27,19 24,17 21,13 I/O transfer information to or from the CPU. D0 is the least 26,20 23,18 20,14 significant bit of the data bus and the first serial data bit to be 25,21 22,19 19,15 received or transmitted. R/-W 9 8 3 I Read/Write strobe. When -CS is asserted, a high on this pin transfers the contents of the XR68C92/192 data bus to the CPU, and a low on this pin will transfer the contents of the CPU data bus to the addressed register. -INT 24 21 18 O Interrupt output (open drain, active low) This pin goes low upon occurrence of one or more of eight maskable interrupt conditions (when enabled by the interrupt mask register). CPU can read the interrupt status register to determine the interrupting condition(s). This output requires a 10k ohms pull-up resistor. XTAL1 36 32 30 I Crystal input 1 or external clock input. A crystal can be connected between this pin and XTAL2 pin to utilize the internal oscillator circuit. An external clock can be used to clock internal circuit and baud rate generator for custom transmission rates. Symbol Pin Signal Pin Description 44 40 44* type |
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Similar Description - XR68C192 |
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