CMOSTEK CMT2189C, Руководство пользователя

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AN202
V1.0 | Page 19/73
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used for subsequent chip upgrading.
4.1.3 TMR0
（
Addr:0x01
）
Table 4-3. TMR0 Register
Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
TMR0 Timer0<7:0>
，
Count result register
Reset X X X X X X X X
Type RW
4.1.4 STATUS
（
Addr:0x03
）
Table 4-4. STATUS Register
Name Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
STATUS - - PAGE /TF /PF Z HC C
Reset - - 0 1 1 X X X
Type - - RW R R RW RW RW
Table 4-5. STATUS Bit Function Description
Bit Name Function
7:6 - No function, read as
“0”
5 PAGE
Register Bank Select bit:
0 = BANK0
（
00h-7Fh
）
1 = BANK1
（
80h-FFh
）
4 /TF
Time-out bit
1 = After power-up, CLRWDT instruction or SLEEP instruction
0 = A WDT time-out occured.
3 /PF
Power-down bit
1 = After power-up or by the CLRWDT instruction
0 = By executation of the SLEEP instruction
2 Z
Zero bit
1 = The result of an arithmetic or logic operation is zero
0 = The result of an arithmetic or logic operation is not zero
1 HC
Half-carry/ bit(ADDWF
、
ADDLW
、
SUBLW
、
SUBWF instructions)
1 = A carry/ from the 4
th
low-order bit of the result occurred
0 = No carry/ from the 4
th
low-order bit of the result occurred
0 C
Carry/ bit(ADDWF
、
ADDLW
、
SUBLW
、
SUBWF instructions)
1 = A carry/ from the Most Significant bit of the result occurred
0 = No carry/ from the Most Significant bit of the result occurred