UPD17072 datasheet(83/226 Pages) NEC

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µPD17072,17073

12.2.2 Flip-flop and BTM0CY flag

The flip-flop is set at fixed time intervals and its status is detected by the BTM0CY flag of the basic timer 0 carry

The BTM0CY flag is a read-only flag, and is reset to “0” if its contents are read (Read & Reset) by using the

instructions shown in Table 12-1.

The BTM0CY flag is reset to “0” at power-ON reset, and is set to “1” at CE reset and at CE reset after the clock

stop instruction is executed. Therefore, this flag can be used as a power failure detection flag.

The BTM0CY flag is not set until its contents are read by the instruction shown in Table 12-1 after application of

the supply voltage. Once a read instruction has been executed, this flag is set at fixed time intervals.

Figure 12-2 shows the configuration and function of the basic timer 0 carry register.

Table 12-1. Instructions to Reset BTM0CY Flag

Mnemonic

Operand

Mnemonic

Operand

ADD

m, #n4

ADD

r, m

ADDC

SUB

SUBC

AND

XOR

SKE

SKEG

SKT

m, #n

SKLT

SKF

SKNE

MOV

@r, m

m, @r

Note

When the row address of m is 5H and 1H is written to r.

Remark

m = 51H

UPD17072 bảng dữ liệu(PDF) 83 Page - NEC