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PCF84C42A Datasheet(PDF) 5 Page - NXP Semiconductors |
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PCF84C42A Datasheet(HTML) 5 Page - NXP Semiconductors |
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5 / 16 page  1996 Nov 20 5 Philips Semiconductors Product specification 8-bit microcontrollers PCF84C12A; PCF84C22A; PCF84C42A 5 PINNING INFORMATION 5.1 Pinning Fig.2 Pin configuration. 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 PCF84C12A PCF84C22A PCF84C42A MBC952 P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 INT/T0 VSS T1 XTAL1 XTAL2 RESET P1.0 P1.1 P1.3 P1.2 P1.4 VDD 5.2 Pin description Table 1 DIP20 and SO20 packages SYMBOL PIN TYPE DESCRIPTION P0.0 to P0.7 1 to 8 I/O 8 bits of Port 0: 8-bit quasi-bidirectional I/O port INT/T0 9 I Interrupt/Test 0 VSS 10 P ground T1 11 I Test 1/count input of 8-bit timer/event counter 1 XTAL1 12 I crystal oscillator input or external clock input XTAL2 13 O crystal oscillator output RESET 14 I Reset input P1.0 to P1.4 15 to 19 I/O 4 bits of Port 1: 4-bit quasi-bidirectional I/O port VDD 20 P positive supply 6 INSTRUCTION SET Since the I2C-bus interface, Port 2 and derivative logic are not provided, instructions associated with these functions are not available. ROM space is restricted to 1 kbyte for the PCF84C12A, 2 kbytes for the PCF84C22A and 4 kbytes for the PCF84C42A. Therefore, the instructions SEL MB1/2/3 for the PCF84C12A and PCF84C22A, and the instructions SEL MB2/3 for PCF84C42A should be avoided as they would define non-existing program memory banks. As RAM space is limited to 64 bytes, care should be taken to avoid accesses to non-existing RAM locations. Refer to the “PCF84CxxxA family” data sheet, for a complete description of the instruction set. |
Similar Part No. - PCF84C42A |
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Similar Description - PCF84C42A |
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