Z8018933FSC データシートの表示（PDF） - Zilog

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Z8018933FSC

GENERAL-PURPOSE EMBEDDED CONTROLLERS

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PRELIMINARY

ACSI TIME CONSTANT REGISTERS

New Z8S180 Registers

Z80189/Z8L189

GENERAL-PURPOSE EMBEDDED CONTROLLERS

7 6 54 3 21 0

Register: ASCI0 Time Constant Low

Address: 1Ah

7 6 54 3 21 0

Register: ASCI1 Time Constant Low

Address: 1Ch

7 6 54 3 21 0

Register: ASCI0 Time Constant High

Address: 1Bh

7 6 54 3 21 0

Register: ASCI1 Time Constant High

Address: 1Dh

CLOCK MULTIPLIER REGISTER (Z180 MPU ADDRESS 1EH)

Bit 7. X2 Clock Multiplier Mode. When this bit is set to 1, this

allows the programmer to double the internal clock from

that of the external clock. This feature will only operate

effectively with frequencies of 10-16 MHz (20-33 MHz

internal).

When this bit is set to 0, the Z189 device will operate in

normal mode. Upon powerup, this feature is disabled.

Bit 0-6. Reserved. Maintains a logic 1 value when read.

New Z8S180 Register

765 43210

0 11 1 1 11 1

Reserved

X2 Clock Multiplier Mode

0 = Disable

1 = Enable

Figure 44. Clock Multiplier Register

(Z180 MPU Address 1EH)

48

DS971890301

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