EM78P520N datasheet(21/124 Pages) EMC

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EM78P520N

8-Bit Microprocessor with OTP ROM

Product Specification (V1.4) 04.08.2016

 13

(This specification is subject to change without prior notice)

6.2.5

R4 (RAM Select Register)

Bit 7 (VDB): Voltage Detector. This is a read only bit. When VDD pin voltage is lower

then Vdet (select by LVDS0~LVDS1) this bit will be cleared.

0 : low voltage is detected

1 : low voltage is not detected or LVD function is disabled

Bit 6 (BNC): Bank Control Register

0 : allow to access only Bank 0 registers

1 : Allow to access all registers of any Bank

Bits 5~0:

are used to select up to 64 registers in the indirect addressing mode.

See the the data memory configuration. User can use BANK instruction to

change bank.

6.2.6

Bank 0 R5 (RAM Bank Select Register)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

BS2

BS1

BS0

Bits 7~3: Reserved

Bits 2~0 (BS2~BS0): RAM Bank Select Register

BS2

BS1

BS0

RAM Bank

Bank 0

Bank 1

Bank 7

6.2.7

Bank 0 R7 (Port 7)

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 (R77~R70): 8-bit I/O Registers of Port 7.

6.2.8

Bank 0 R8 (Port 8)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

R87

R86

R85

R84

R83

R82

R81

Bits 7~1 (R87~R81): 7-bit I/O Registers of Port 8.

Bit 0:

Reserved

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