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EM78P221/2N
8-Bit Microcontroller with OTP ROM
6 •
Product Specification (V1.0) 10.19.2007
(This specification is subject to change without further notice)
5 Block Diagram
ROM
R3 (Status
Reg.)
ACC
Instruction
Decoder
Instruction
Register
ALU
PC
Interrupt
Circuit
8-level stack
(13 bit)
Interrupt
Control
Register
Oscillation
Generation
RAM
Mux
.
Ext.
OSC.
R4
Ext.
RC
Int.
RC
Comparator
LVR
Cin+ Cin- CO
P5
P50
P57
P56
P55
P54
P53
P52
P51
Ext INT
Reset
P6
P60
P67
P66
P65
P64
P63
P62
P61
P7
P70
P74
P73
P72
P71
P8
P81
WDT
TCC
Port
change
TCC
Port 6
P77
P75
P76
P80
Fig. 5-1 EM78P221/2N Functional Block Diagram