z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 189

• Manufacturer Part Number: z80189
• Description: Z80180, Z8s180, Z8l180 Mpu Operation
• Manufacturer: ZiLOG Semiconductor

174
UM005003-0703
Z8018x
Family MPU User Manual
MLT- Multiply
The MLT performs unsigned multiplication on two 8-bit numbers yielding a
16-bit result. MLT may specify BC, DE, HL, or SP registers. The 8-bit
operands are loaded into each half of the 16-bit register and the 16-bit result
is returned in that register.
OTIM, OTIMR, OTDM, OTDMR - Block I/O
The contents of memory pointed to by HL is output to the I/O address in (C).
The memory address (HL) and I/O address (C) are incremented in OTIM
and OTIMR and decremented in OTDM and OTDMR, respectively. The B
register is decremented. The OTIMR and OTDMR variants repeat the above
sequence until register B is decremented to 0. Since the I/O address (C) is
automatically incremented or decremented, these instructions are useful for
block I/O (such as Z80180 on-chip I/O) initialization. When I/O is accessed,
00H is output in high-order bits of address automatically.
TSTIO m - Test I/O Port
The contents of the I/O port addressed by C are ANDed with immediately
specified 8-bit data and the status flags are updated. The I/O port contents
are not written (non-destructive AND). When I/O is accessed,
output in higher bits of address automatically.
TST g - Test Register
Perform an
the accumulator (A) and the status flags are updated. The accumulator
and specified register are not changed (non-destructive
TST m - Test Immediate
Perform an
8-bit data with the accumulator (A) and the status flags are updated. The
accumulator is not changed (non-destructive
AND
AND
instruction on the contents of the specified register with
instruction on the contents of the immediately specified
AND
).
AND
).
00H
is