Appendix
Ports
Port Direction Description
00H In Keypad press encoder
- Bit 0-4 HexPad
- Bit 5 Function Key (Active Low)
- Bit 6-7 N/A
01H Out Seven segment digits switch
- Bit 0-1 Data Segments
- Bit 2-5 Address Segments
- Bit 6 FTDI Rx (Out), Disco LED's
- Bit 7 Speaker
02H Out Seven segment LED switch
- Bit 0 G segment
- Bit 1 F segment
- Bit 2 C segment
- Bit 3 D segment
- Bit 4 E segment
- Bit 5 DP segment
- Bit 6 B segment
- Bit 7 A segment
03H In System Input
- Bit 0 Matrix Keyboard (DIP-3)
- Bit 1 Protect Mode (DIP-3)
- Bit 2 Expand Mode (DIP-3)
- Bit 3 Expand Status
- Bit 4 Cartridge Flag
- Bit 5 General Input
- Bit 6 Keypress Flag
- Bit 7 FTDI Tx (In)
04H In/Out LCD Instruction
05H Out LED 8x8 Matrix Horizontal (TEC Expander)
06H Out LED 8x8 Matrix Vertical (TEC Expander)
07H Out Graphical LCD Instruction
84H In/Out LCD Data
Serial Connection
Function Key Shortcuts
Port Direction Description
87H Out Graphical LCD Data
F8H In/Out Spare (TEC Expander & I/O Bus)
F9H In/Out Spare (TEC Expander & I/O Bus)
FAH In/Out Spare (I/O Bus)
FBH In/Out Spare (General I/O & I/O Bus)
FCH In/Out RTC (Real Time Clock) (General I/O & I/O Bus)
FDH In/Out SD (Secure Digital) Flash Card (General I/O)
FEH In Matrix Keyboard
FFH Out System Latch
- Bit 0 Shadow (Active Low)
- Bit 1 Protect
- Bit 2 Expand
- Bit 3 FF-D3 (Mem Bus)
- Bit 4 FF-D4 (Mem Bus)
- Bit 5 FF-D5 (Mem Bus)
- Bit 6 FF-D6 (Mem Bus)
- Caps Lock (Matrix Keyboard)
Serial Connection
Constant Value
FTDI to USB Serial Transmission 4800-8-N-2
- Baud 4800, 8 Packet Bits
Baud rate value can be modified - No Parity, 2 Stop bits
but other constants are the same.
Function Key Shortcuts
0 Quick Links 1-3 Addr. Jump 4 Intel Load 5 GLCD Term
6 Save Session 7 Load Session 8 NOP's Fill A Restore Blk.
B Backup Blk. C Smart Copy D Diss. View E Expand
F Catalog AD Main Menu + Insert Byte - Delete Byte
LCD Cheatsheet
Z80 instructions to communicate with the LCD screen are given as direct commands. IE: OUT (04),A. Mon3 also provides API routines that do the same but also check for the LCD busy state. If using direct port instructions, the LCD busy flag is to be checked prior to the instruction call. The example code provided uses the API routines.
To move the cursor to Row 2, Column 10 do LD A,0xC9 / OUT (04),A For IN A,(04), If Bit 7 is set, then LCD is Busy. Other bits are the current Address Counter
Character Table
Example Using CGRAM and DDRAM
_stringToLCD .equ 13
_charToLCD .equ 14
_commandToLCD .equ 15
; LCD Setup
ld c,_commandToLCD 4000 0E 0F ;LCD Instruction API routine
ld b,01H 4002 06 01 ;Clear display
rst 10H 4004 D7 ;call API routine
ld b,38H 4005 06 38 ;8-Bit, 2 Lines, 5x8 Characters
rst 10H 4007 D7 ;call API routine
; Tell the LCD that next data will be to CGRAM
ld b,40H 4008 06 40 ;CGRAM entry
rst 10H 400A D7 ;call API routine
; Save multiple characters to CGRAM using lookup table
ld b,40H 400B 06 40 ;8 Characters (8 bytes each)
ld c,_charToLCD 400D 0E 0E ;LCD Data API routine
ld hl,403FH 400F 21 3F 40 ;LCD custom character table
loop1:
ld a,(hl) 4012 7E ;get custom character byte
inc hl 4013 23 ;move to next item in table
rst 10H 4014 D7 ;call API routine
djnz loop1 4015 10 FB ;continue for all 64 char bytes
; Display first line of text
ld c,_commandToLCD 4017 0E 0F ;LCD Instruction API routine
ld b,82H 4019 06 82 ;Move Cursor to Row 1, Col 3
rst 10H 401B D7 ;call API routine
ld hl,4034H 401C 21 34 40 ;ASCII text
ld c,_stringToLCD 401F 0E 0D ;LCD String API routine
rst 10H 4021 D7 ;call API routine
; Display custom characters
ld c,_commandToLCD 4022 0E 0F ;LCD Instruction API routine
ld b,0C0H 4024 06 C0 ;Move Cursor to Row 2, Col 1
rst 10H 4026 D7 ;call API routine
ld b,08H 4027 06 08 ;8 Characters
ld c,_charToLCD 4029 0E 0E ;LCD Data API routine
loop2:
ld a,b 402B 78 ;set A to current character
rst 10H 402C D7 ;call API routine
ld a,20H 402D 3E 20 ;space character
rst 10H 402F D7 ;call API routine
djnz loop2 4030 10 F9 ;continue for all 8 characters
; All Done, wait for key press and exit
rst 08H 4032 CF ;key wait and press (HALT)
ret 4033 C9 ;exit
TEXT TABLE: 4034 48 45 4C 4C 4F 20 54 45 43 21 00 ; "HELLO TEC!"
CHAR TABLE: 403F 00 0A 1F 1F 0E 04 00 00 ; Heart
4047 04 0E 0E 0E 1F 00 04 00 ; Bell
404F 1F 15 1F 1F 0E 0A 1B 00 ; Alien
4057 00 01 03 16 1C 08 00 00 ; Tick
405F 01 03 0F 0F 0F 03 01 00 ; Speaker
4067 01 03 05 09 09 0B 1B 18 ; Note
406F 00 0E 15 1B 0E 0E 00 00 ; Skull
4077 0E 11 11 1F 1B 1B 1F 00 ; Lock
