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5962H9563801VQA Datasheet(PDF) 2 Page - Aeroflex Circuit Technology |
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5962H9563801VQA Datasheet(HTML) 2 Page - Aeroflex Circuit Technology |
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2 / 19 page  2 1.0 INTRODUCTION The UT69RH051 is a radiation-tolerant 8-bit microcontroller that is pin equivalent to the MCS-51 industry standard microcontroller when in a 40-pin DIP. The UT69RH051’s static design allows operation from 1Hz to 20MHz. This data sheet describes hardware and software interfaces to the UT69RH051. 2.0 SIGNAL DESCRIPTION VDD: +5V Supply voltage VSS: Circuit Ground Port 0 (P0.0 - P0.7): Port 0 is an 8-bit port. Port 0 pins are used as the low-order multiplexed address and data bus during accesses to external program and data memory. Port 0 pins use internal pullups when emitting 1’s and are TTL compatible. Port 1 (P1.0 - P1.7): Port 1 is an 8-bit bidirectional I/O port with internal pullups. The output buffers can drive TTL loads. When the Port 1 pins have 1’s written to them, they are pulled high by the internal pullups and can be used as inputs in this state. As inputs, any pins that are externally pulled low sources current because of the pullups. In addition, Port 1 pins have the alternate uses shown in table 1. Port 2 (P2.0 - P2.7): Port 2 is an 8-bit port. Port 2 pins are used as the high-order address bus during accesses to external Program Memory and during accesses to external Data Memory that uses 16-bit addresses (i.e., MOVX@DPTR). Port 2 uses internal pullups when emitting 1’s in this mode. During operations that do not require a 16-bit address, Port 2 emits the contents of the P2 Special Function Registers (SFR). The pins have internal pullups and drives TTL loads. Port 3 (P3.0 - P3.7): Port 3 is an 8-bit bidirectional I/O port with internal pullups. The output buffers can drive TTL loads. When the Port 3 pins have 1’s written to them, they are pulled high by the internal pullups and can be used as inputs in this state. As inputs, any pins that are externally pulled low sources current because of the pullups. In addition, Port 3 pins have the alternate uses shown in table 2. Table 1. Port 1 Alternate Functions Table 2. Port 3 Alternate Functions Port Pin Alternate Name Alternate Function P1.0 T2 External clock input to Timer/ Counter 2 P1.1 T2EX Timer/Counter 2 Capture/Reload trigger and direction control P1.2 ECI External count input to PCA P1.3 CEX0 External I/O for PCA capture/ compare Module 0 P1.4 CEX1 External I/O for PCA capture/ compare Module 1 P1.5 CEX2 External I/O for PCA capture/ compare Module 2 P1.6 CEX3 External I/O for PCA capture/ compare Module 3 P1.7 CEX4 External I/O for PCA capture/ compare Module 4 Port Pin Alternate Name Alternate Function P3.0 RXD Serial port input P3.1 TXD Serial port output P3.2 INT0 External interrupt 0 P3.3 INT1 External interrupt 1 P3.4 T0 External clock input for Timer 0 P3.5 T1 External clock input for Timer 1 P3.6 WR External Data Memory write strobe P3.7 RD External Data Memory read strobe |
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