HD4046212RFS datasheet(103/157 Pages) RENESAS

tên linh kiện	HD4046212RFS

Giải thích chi tiết về linh kiện	AS Microcomputer Incorporating a DTMF Generator Circuit

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HD404629R Series

101

System Clock Select Register (SSR: $029): Four-bit write-only register. This register must be set to the

value specified in figure 91 depending on the frequency of the oscillator connected to the OSC

1 and OSC2

pins. Note that if the combination of the oscillation frequency and the value in this register is different

from that specified in figure 91, the DTMF output frequencies will differ from the correct frequencies as

listed in figure 89.

Bit

Initial value

Read/Write

Bit name

SSR3

SSR2

SSR0

SSR1

System clock select register (SSR: $029)

SSR1

System clock selection

400 kHz

800 kHz

2 MHz

4 MHz

SSR0

SSR2

ratio selection

fSUB = fX/8

fSUB = fX/4

SSR3

32-kHz oscillation stop

Oscillation operates in stop mode

Oscillation stops in stop mode

32-kHz oscillation division

Note: SSR3 is cleared only by a RESET input. SSR3 will not be cleared by a

STOPC input during stop

mode, and will retain its value. SSR3 will also not be cleared upon entering stop mode.

Figure 91 System Clock Select Register (SSR)

HD4046212RFS bảng dữ liệu(PDF) 103 Page - Renesas Technology Corp