EM78159NAS EMC [ELAN Microelectronics Corp], EM78159NAS Datasheet - Page 10

• Manufacturer Part Number: EM78159NAS
• Description: 8-Bit Microcontroller with OTP ROM
• Manufacturer: EMC [ELAN Microelectronics Corp]

EM78P159N
8-Bit Microcontrollerwith OTP ROM
4
6 •
Control
Oscillator/Timing
OSCI
Function Description
4.1
OSCO
/RESET
R6
IOC6
Operational Registers
4.1.1 R0 (Indirect Addressing Register)
R0 is not a physically implemented register. Its major function is to perform as an
indirect addressing pointer. Any instruction using R0 as a pointer actually accesses
data pointed by the RAM Select Register (R4).
4.1.2 R1 (Time Clock /Counter)
I/O
PORT 6
IOCA
Increased by an external signal edge, which is defined by TE bit (CONT-4)
through the TCC pin, or by the instruction cycle clock.
Writable and readable as any other registers.
Defined by resetting PAB(CONT-3).
The prescaler is assigned to TCC, if the PAB bit (CONT-3) is reset.
The contents of the prescaler counter will be cleared only when TCC register is
written with a value.
RAM
R4
WDT timer
Prescaler
R1(TCC)
DATA & CONTROL BUS
Figure 4-1 Function Block Diagram
Interrupt
Controller
TCC
/INT
P60//INT
P61
P62
P63
P64
P65
P66
P67
(This specification is subject to change without further notice)
Instruction
Decoder
Instruction
Register
ROM
R5
IOC5
Product Specification (V1.0) 03.10.2006
I/O
PORT 5
R2
R3
ALU
Stack
ACC
P50
P51
P52
P53
P54
P55
P56