EM78P458AP datasheet(11/76 Pages) EMC

11 / 76 page

EM78P458/459

OTP ROM

4. R3 (Status Register)

CMPOUT

PS1

PS0

• Bit 7 (CMPOUT) the result of the comparator output.

• Bit 6 (PS1) ~ 5 (PS0) Page select bits. PS0~PS1 are used to select a program memory page. When

executing a "JMP", "CALL", or other instructions which cause the program counter to be changed

(e.g. MOV R2, A), PS0~PS1 are loaded into the 11th and 12th bits of the program counter where it

selects one of the available program memory pages. Note that RET (RETL, RETI) instruction does

not change the PS0~PS1 bits. That is, the return will always be to the page from the place where the

subroutine was called, regardless of the current setting of PS0~PS1 bits.

PS1

PS0

Program memory page [Address]

Page 0 [000-3FF]

Page 1 [400-7FF]

Page 2 [800-BFF]

Page 3 [C00-FFF]

• Bit 4 (T) Time-out bit. Set to 1 by the "SLEP" and "WDTC" commands, or during Power on and reset

to 0 by WDT time-out.

• Bit 3 (P) Power-down bit. Set to 1 during power-on or by a "WDTC" command and reset to 0 by a

"SLEP" command.

• Bit 2 (Z) Zero flag. Set to "1" if the result of an arithmetic or logic operation is zero.

• Bit 1 (DC) Auxiliary carry flag

• Bit 0 (C) Carry flag

5. R4 (RAM Select Register)

• Bit 7 is a general-purpose read/write bit.

• Bit 6 is used to select bank 0 or bank 1.

• Bits 0~5 are used to select registers (address: 00~3F) in the indirect address mode.

6. R5 ~ R6 (Port 5 ~ Port 6)

• R5 and R6 are I/O registers.

7. R7 ~ R8

• All of these are 8-bit general-purpose registers.

8. R9 (ADCON: Analog to Digital Control)

IOCS

ADRUN

ADPD

ADIS2

ADIS1

ADIS0

• Bit 7:Bit 6 Unemployed, read as ‘0’;

• Bit 5(IOCS): Select the Segment of IO control register.

This specification is subject to change without prior notice.

06.25.2004 (V1.4)

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