EM78458AM datasheet(13/62 Pages) EMC

13 / 62 page

EM78458/459

8-Bit Microcontroller with MASK ROM

Product Specification (V1.4) 05.27.2005

• 7

(This specification is subject to change without further notice)

4.1.4 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

duringPower 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

4.1.5 R4 (RAM Select Register)

Bits 0~5

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

Bit 6

is used to select bank 0 or bank 1.

Bit 7

is a general-purpose read/write bit.

See the configuration of the data memory in Fig. 4.

4.1.6 R5 ~ R6(Port 5 ~ Port 6)

R5 and R6 are I/O registers.

4.1.7 R7 ~ R8

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

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