UPD17145CT datasheet(49/102 Pages) NEC

tên linh kiện	UPD17145CT

Giải thích chi tiết về linh kiện	SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS

PDF	102 Pages

Scroll/Zoom	100%

nhà sản xuất	NEC [NEC]

Trang chủ	http://www.nec.com/

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49 / 102 page

µPD17145(A1), 17147(A1), 17149(A1)

(2) Timing in single mode (compare operation)

Figure 14-4. Timing in Single Mode (Compare Operation)

After 1 has been written to ADCSTRT in the single mode (execution of the POKE instruction), a value is

stored to ADCCMP three instructions after, and the result of comparison can be read by the PEEK

instruction. Even if data is set to ADCR (execution of the PUT instruction), comparison is started in the same

manner as ADCSTRT, and the result of comparison can be read three instructions after.

The ADCCMP flag is cleared to 0 when reset is executed or when an instruction that writes data to ADCR

is executed.

Caution

Be sure to set ADCSOFT to 1 before setting a value to ADCR. When ADCSOFT = 0, no value

can be set to ADCR (the PUT ADCR, DBF instruction is invalidated).

Remark

Sampling time = 14/fx (1.75

µs, at 8 MHz)

Sampling capacitor capacitance = 100 pF (MAX.)

Sampling

POKE

PEEK

PUT

PEEK

ADCSTRT

ADCEND

ADCCMP

ADCSTRT executed

→ Number of executed instructions (instruction cycle)

Previous data

Comparison result

ADCCMP read

UPD17145CT bảng dữ liệu(PDF) 49 Page - NEC