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EM785840P

8-BIT MICRO-CONTROLLER

ELAN Microelectronics 

EM785840/5841/5842

8-bit Micro-controller

IOC PAGE registers

Addr IOC PAGE0

IOC PAGE1

00

01

02

03

04

05

06 Port6 I/O control Port6 switches

07 Port7 I/O control Port7 pull high

08

09 Port9 I/O control

0A

0B

ADC control

0C

0D

Clock source (CN1)

Prescaler(CN1)

0E Interrupt mask

0F Interrupt mask

10

:

1F

20

:

3F

* IOC register are special registers. User can use instruction

“IOW” to write data or “IOR” to read data.

VII.2 Operational Register Detail Description

R0 (Indirect Addressing Register)

R0 is not a physically implemented register. It is used as indirect addressing pointer. Any instruction using R0

as register actually accesses data pointed by the RAM Select Register (R4).

Example:

Mov A, @0x20

;store a address at R4 for indirect addressing

Mov 0x04, A

Mov A, @0xAA

;write data 0xAA to R20 at bank0 through R0

Mov 0x00, A

R1 (TCC)

TCC data buffer. Increased by 16.384KHz or by the instruction cycle clock (controlled by CONT register).

Written and read by the program as any other register.

R2 (Program Counter)

The structure is depicted in Fig.3.

Generates 4k × 13 external ROM addresses to the relative programming instruction codes.

"JMP" instruction allows the direct loading of the low 10 program counter bits.

"CALL" instruction loads the low 10 bits of the PC, PC+1, and then push into the stack.

"RET'' ("RETL k", "RETI") instruction loads the program counter with the contents at the top of stack.

__________________________________________________________________________________________________________________________________________________________________

* This specification is subject to change without notice.

7

2004/11/10 V1.2

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