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