EM78P258N
8-Bit Microprocessor with OTP ROM
4
Functional Block Diagram
WDT timer
TCC
/INT
ROM
R2
STACK 0
STACK 1
STACK 2
STACK 3
OSCI
OSCO
/RESET
Oscillator Timing
STACK 4
Control
Prescaler
STACK 5
Interrupt
controller
RAM
Built-in
OSC
R1(TCC)
Instruction
Register
STACK 6
STACK 7
ALU
R4
Instruction
decoder
R3
ACC
DATA & CONTROL BUS
ADC0/P50
ADC1/P51
ADC2/P52
ADC3/P53
VREF/TCC/P54
OSCI/P55
P56
P57
I/O
PORT5
IOC5
COUNTER
IOC6/7
I/O
PORT6/7
R5
R6/7
P60/INT
P61/TCCA
P66
P67/IR OUT
P70/OSCO
Fig. 4-1 EM78P258N Functional Block Diagram
Product Specification (V1.0) 06.16.2005
(This specification is subject to change without further notice)
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