The system can be expanded by adding various modules to the expansion bus. All signals have 3.3V logic. External modules need to follow the same pinout as in the picture below.
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GND +5V A0 A2 A4 A6 A8 A10 A12 A14 A16 A18 A20 A22 MEM# RD# INSTR# BUSACK# WAIT# HALT# D1 D3 D5 D7 CS1# CS3# PB2 PC0/TxD1 PD0/TxD0 PD2/RTS0# PD4/DTR0# PD6/DCD0# SCL SOUND unused GND |
• 1 2 • • 3 4 • • 5 6 • • 7 8 • • 9 10 • • 11 12 • • 13 14 • • 15 16 • • 17 18 • • 19 20 • • 21 22 • • 23 24 • • 25 26 • • 27 28 • • 29 30 • • 31 32 • • 33 34 • • 35 36 • • 37 38 • • 39 40 • • 41 42 • • 43 44 • • 45 46 • • 47 48 • • 49 50 • • 51 52 • • 53 54 • • 55 56 • • 57 58 • • 59 60 • • 61 62 • • 63 64 • • 65 66 • • 67 68 • • 69 70 • • 71 72 • |
GND +5V A1 A3 A5 A7 A9 A11 A13 A15 A17 A19 A21 A23 IO# WR# FREQ_CPU BUSREQ# NMI# D0 D2 D4 D6 CS0# CS2# PB0/T0IN PB5/T5OUT (FLASH_CS#) PC1/RxD1 PD1/RxD0 PD3/CTS0# PD5/DSR0# PD7/RI0# SDA RESET# unused GND |
Physically the bus is built from a standard dual-row 72-way header with 2.54mm (0.1”) pitch.
A suggested mechanical format of Z20X controller is shown in the picture.
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108mm |
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60mm
External connectors on this end
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Expand this side if needed |
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8.28mm |
Pin 1 Bus Connector here |
8.28mm |
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