Z8927320VSC Zilog, Z8927320VSC Datasheet - Page 27

• Manufacturer Part Number: Z8927320VSC
• Description: DSP 20MHZ 16-BIT W/ A/D 44-PLCC
• Manufacturer: Zilog
• Series: Z892x3r
• Type: Fixed Pointr

Specifications of Z8927320VSC

• Interface: SPI, 3-Wire Serial
• Clock Rate: 20MHz
• Non-volatile Memory: OTP (16 kB)
• On-chip Ram: 1kB
• Voltage - I/o: 5.00V
• Voltage - Core: 5.00V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 44-LCC (J-Lead)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 269-1124

ZiLOG
REGISTERS
Both external and internal registers are accessed in one ma-
chine cycle. The external registers are used to access the on-
chip peripherals when they are enabled.
The internal registers of the Z893X3 are defined below:
X
These registers can be utilized as temporary registers when
the multiplier is not being used.
P
A
to this register. When 16-bit data is transferred into this reg-
ister, it is placed into the 16 MSBs and the least significant
eight bits are set to zero. Only the upper 16 bits are trans-
ferred to the destination register when the Accumulator is
selected as a source register in transfer instructions.
Pn:b
n = 0, 1, or 2, and b = 0 or 1. They can be directly read or
written. They point to locations in data RAM.
PC
modify this register requires two clock cycles.
SR
cessor control bits. The status register can always be read
in its entirety. S15–S10 are set/reset by hardware and can
DS000202-DSP0599
Register
X
Y
P
A
Pn:b
PC
SR
EXT0
EXT1
EXT2
EXT3
EXT4
EXT5
EXT6
EXT7
holds the result of multiplications and is read-only.
is a 24-bit Accumulator. The output of the ALU is sent
and
is the status register. It contains the ALU status and pro-
is the Program Counter. Any instruction which may
are the pointer registers for accessing data RAM where
Y
are two 16-bit input registers for the multiplier.
Register Definition
Multiplier X Input, 16-bits
Multiplier Y Input, 16-bits
Multiplier Output, 24-bits
Accumulator, 24-bits
Six Data RAM Pointers, 8-bits each
Program Counter, 16-bits
Status Register, 16-bits
depends on Bank Select #, 16-bits
depends on Bank Select #, 16-bits
depends on Bank Select #, 16-bits
depends on Bank Select #, 16-bits
depends on Bank Select #, 16-bits
depends on Bank Select #, 16-bits
depends on Bank Select #, 16-bits
Interrupt Status/Bank Select, 16-bits
only be read by software. S9–S0 control hardware opera-
tions and can be written by software.
Note: RO = read only, RW = read/write. The status register can
S15–S12
S11–S10
If
shifts the result three bits right. This feature allows the data
to be scaled and prevents overflows.
If
negative values instead of overflowing.
S7
S6–S5
the Status Register appears on bits 2 and 3 of Port2 if the
User Outputs are enabled by writing a 1 to Bit 15 of Bank
15–EXT3, and Counter/Timer 0 and 1 are disabled.
S4–S3
of addressing.
S2–S0
ble 12.
SR Bit
S15 (N)
S14 (OV)
S13 (Z)
S12 (C)
S11 (UI1)
S10 (UI0)
S9 (SH3)
S8 (OP)
S7 (IE)
S6 (UO1)
S5 (UO0)
S4–S3
S2–S0 (RPL)
S9
S8
16-Bit Digital Signal Processors with A/D Converter
enables interrupts.
is set, the hardware clamps at maximum positive or
is set and a multiply/shift option is used, the shifter
define the RAM pointer loop size as indicated in Ta-
always be read in its entirety.
are User Outputs. The complement of the value in
are the two MSBs in the “short form direct” mode
Table 11. Status Register Bit Functions
are set/reset by the ALU after an operation.
are set/reset by the user input pins.
Function
ALU Negative
ALU Overflow
ALU Zero
Carry
User Input 1
User Input 0
MPY Output
Arithmetically Shifted
Right by Three Bits
Overflow Protection
Interrupt Enable
User Output 1
User Output 0
“Short Form Direct” bits R/W
RAM Pointer Loop Size
Z89223/273/323/373
Read/Write
RO
RO
RO
RO
RO
RO
R/W
R/W
R/W
R/W
R/W
R/W
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