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TMS370C068AFNA Datasheet(PDF) 2 Page - Texas Instruments |
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TMS370C068AFNA Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 74 page  TMS370Cx6x 8-BIT MICROCONTROLLER SPNS033C – SEPTEMBER 1995 – REVISED FEBRUARY 1997 2 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 Pin Descriptions PIN † ‡ NAME ALTERNATE FUNCTION PLCC (68) I/O† DESCRIPTION‡ A0 A1 A2 A3 A4 A5 A6 A7 DATA0 DATA1 DATA2 DATA3 DATA4 DATA5 DATA6 DATA7 17 18 19 20 21 22 23 24 I/O Single-chip mode: Port A is a general-purpose bidirectional I/O port. Expansion mode: Port A can be individually programmed as the external bidirectional data bus (DATA0 – DATA7). B0 B1 B2 B3 B4 B5 B6 B7 ADDR0 ADDR1 ADDR2 ADDR3 ADDR4 ADDR5 ADDR6 ADDR7 65 66 67 68 1 2 3 4 I/O Single-chip mode: Port B is a general-purpose bidirectional I/O port. Expansion mode: Port B can be individually programmed as the low-order address output bus (ADDR0 – ADDR7). C0 C1 C2 C3 C4 C5 C6 C7 ADDR8 ADDR9 ADDR10 ADDR11 ADDR12 ADDR13 ADDR14 ADDR15 5 7 8 10 11 12 13 14 I/O Single-chip mode: Port C is a general-purpose bidirectional I/O port. Expansion mode: Port C can be individually programmed as the high-order address output bus (ADDR8 – ADDR15). INT1 INT2 INT3 NMI — — 52 51 50 I I/O I/O External (nonmaskable or maskable) interrupt/general-purpose input pin External maskable interrupt input/general-purpose bidirectional pin External maskable interrupt input/general-purpose bidirectional pin AN0 AN1 AN2 AN3 AN4 AN5 AN6 AN7 E0 E1 E2 E3 E4 E5 E6 E7 36 37 38 39 40 41 42 43 I ADC1 analog input (AN0 – AN7) or positive reference pins (AN1 – AN7) Port E can be programmed individually as general-purpose input pins if not used as ADC1 analog input or positive reference input. VCC3 VSS3 34 35 ADC1 positive-supply voltage and optional positive-reference input pin ADC1 ground reference pin RESET 53 I/O System reset bidirectional pin. RESET, as an input, initializes the microcontroller; as open-drain output, RESET indicates an internal failure was detected by the watchdog or oscillator fault circuit. MC 6 I Mode control (MC) pin. MC enables EEPROM write-protection override (WPO) mode, also EPROM VPP. XTAL2/CLKIN XTAL1 31 32 I O Internal oscillator crystal input / external clock source input Internal oscillator output for crystal VCC1 33, 61 Positive supply voltage VCC2 15, 63 Positive supply voltage † I = input, O = output ‡ Ports A, B, C, and D can be configured only as general-purpose I/O pins. Also, port D3 can be configured as SYSCLK. |
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