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EM78P5840N

8-Bit Microcontrollers

ELAN Microelectronics 

EM78P5840N/41N/42N

8-Bit Microcontrollers

7.1.2 IOC Page Register Configuration

Addr

00

01

02

03

04

05

06

07

08

09

0A

0B

0C

0D

0E

0F

IOC Page Registers

IOC Page 0

Reserve

Reserve

Reserve

Reserve

Reserve

Reserve

IOC Page 1

Reserve

Reserve

Reserve

Reserve

Reserve

Reserve

Port 6 I/O control

Port 6 switches

Port 7 I/O control

Reserve

Port 7 pull high

Reserve

Port 9 I/O control

Reserve

Reserve

Reserve

Reserve

Port 9 switches

ADC control

Reserve

Reserve

Clock source (CN1)

Prescaler (CN1)

Interrupt mask

Interrupt mask

Reserve

Reserve

The IOC registers are special registers. User can use the “IOW” instruction to write

data and the “IOR” instruction to read data.

7.2 Register Operations

7.2.1 R0 (Indirect Addressing Register)

R0 is not a physically implemented register. It is used as an indirect addressing pointer.

Any instruction using R0 as a register actually accesses data pointed by the RAM

Select Register (R4).

Example:

Mov A, @0x20

Mov 0x04, A

Mov A, @0xAA

Mov 0x00, A

; store an address at R4 for indirect addressing

; write data 0xAA to R20 at Bank0 through R0

Product Specification (V1.0) 04.25.2006

•7

(This specification is subject to change without further notice)

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