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Product Specification (V1.0) 10.19.2007 • iii
(This specification is subject to change without further notice)
Contents
EM78P221/2N-V Package version.................................................................................... 1
EM78P221/2N-U Package version ................................................................................... 1
1 General Description .................................................................................................. 2
2 Features ..................................................................................................................... 2
3 Pin Assignment ......................................................................................................... 3
4 Pin Description.......................................................................................................... 4
4.1 EM78P222N .......................................................................................................4
4.2 EM78P221N .......................................................................................................5
5 Block Diagram ........................................................................................................... 6
6 Function Description ................................................................................................ 7
6.1 Register Configuration........................................................................................ 7
6.2 Registers Description ......................................................................................... 8
6.2.1 A (Accumulator)...................................................................................................8
6.2.2 CONT (Control Register).....................................................................................8
6.2.3 R0 (Indirect Addressing Register) ......................................................................9
6.2.4 R1 (Memory Switch Register) .............................................................................9
6.2.5 R2 (Program Counter and Stack)........................................................................9
6.2.6 R3 (Status Register)..........................................................................................10
6.2.7 R4 (Select Indirect Address) .............................................................................11
6.2.8 Bank 0-R5 (Port 5) ............................................................................................11
6.2.9 Bank 0-R6 (Port 6) ............................................................................................11
6.2.10 Bank 0-R7 (Port 7) ............................................................................................11
6.2.11 Bank 0-R8 (Port 8) ............................................................................................11
6.2.12 Bank 0-R9~RD (Reserve) .................................................................................11
6.2.13 Bank 0-RE (WUCR: Wake-up Control Register)...............................................12
6.2.14 Bank 0-RF (Interrupt Status Register)...............................................................12
6.2.15 Bank 1-R5 ~R7 (I/O Port Control Register).......................................................13
6.2.16 Bank 1-R8 (I/O Port Control Register) ..............................................................13
6.2.17 Bank 1-R9 (Reserve).........................................................................................14
6.2.18 Bank 1-RA (CMPCON: Comparator Control Register) .....................................14
6.2.19 Bank 1-RB (Pull-down Control Register)...........................................................15
6.2.20 Bank 1-RC (Open-Drain Control Register) .......................................................15
6.2.21 Bank 1-RD (Pull-high Control Register) ............................................................16
6.2.22 Bank 1-RE (WDT Control Register) ..................................................................16
6.2.23 Bank 1-RF (Interrupt Mask Register) ................................................................17
6.2.24 Bank 2-R5 (HDCR: High Drive Control Register for Port 6)..............................18
6.2.25 Bank 2-R6 (HSCR1: High Sink Control Register for Port 5) .............................18
6.2.26 Bank 2-R7 (HSCR2: High Sink Control Register for Port 6) .............................19