EM78P468NBQSSLASHNBQJ datasheet(15/82 Pages) EMC

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EM78P468N/L

8-Bit Microcontroller

Product Specification (V1.6) 12.31.2007

• 9

(This specification is subject to change without further notice)

6.1.5 R4/RSR (RAM Select Register)

(Address: 04h)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

RBS1

RBS0

RSR5

RSR4

RSR3

RSR2

RSR1

RSR0

Bits 7 ~ 6 (RBS1 ~ RBS0):

determine which bank is activated among the four banks.

See the data memory configuration in Fig. 6-2. Use the BANK instruction (e.g.

BABK 1) to change banks.

Bits 5 ~ 0 (RSR5 ~ RSR0):

used to select up to 64 registers (Address: 00~3F) in

indirect addressing mode. If no indirect addressing is used, the RSR can be used

as an 8-bit general purpose read/writer register.

6.1.6 R5/Port 5 (Port 5 I/O Data and Page of Register Select

(Address: 05h)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

R57

R56

R55

R54

−

IOCPAGE

Bits 7~4:

Four bits I/O registers of Port 5

User can use the IOC50 register to define each bit either as input or output.

Bits 3~1:

Not used

Bit 0 (IOCPAGE):

change IOC5 ~ IOCF to another page

IOCPAGE = “0” :

Page 0 (select register of IOC 50 to IOC F0)

IOCPAGE = “1” :

Page 1 (select register of IOC 61 to IOC E1)

6.1.7 R6/Port 6 (Port 6 I/O Data Register)

(Address: 06h)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

R67

R66

R65

R64

R63

R62

R61

R60

Bits 7~0:

8-bit I/O registers of Port 6

User can use the IOC60 register to define each bit either as input or output.

6.1.8 R7/Port 7 (Port 7 I/O Data Register)

(Address: 07h)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

R77

R76

R75

R74

R73

R72

R71

R70

Bits 7~0:

8-bit I/O registers of Port 7

User can use the IOC70 register to define each bit either as input or output.

EM78P468NBQS/NBQJ 数据表(PDF) 15 Page - ELAN Microelectronics Corp

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