Z8937320FSG Zilog, Z8937320FSG Datasheet - Page 26

• Manufacturer Part Number: Z8937320FSG
• Description: DSP 20MHZ 80-PQFP
• Manufacturer: Zilog
• Series: Z893x3r
• Type: Fixed Pointr

Specifications of Z8937320FSG

• 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: 80-MQFP, 80-PQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Z89223/273/323/373
16-Bit Digital Signal Processors with A/D Converter
MEMORY MAP
Program Memory.
masked into internal ROM (Z89323) or programmed into
OTP (Z89373). Four locations are dedicated to the vector
addresses for the three interrupt service routines
(1FFDH–1FFFH) and for the starting address following a
RESET (1FFCH). Internal ROM is mapped from 0000H to
1FFFH, and the highest location for program instructions
is 1FFBH.
Internal Data RAM.
internal 512 x 16-bit data RAM organized as two banks of
256 x 16-bit words each (RAM0 and RAM1). The three ad-
dressing modes available to access the data RAM are direct
addressing, short form direct, and register indirect.
The contents of both data RAM banks can be read simul-
taneously and loaded into the X and Y inputs of the multi-
plier during a multiply instruction.
The addresses for each data RAM bank are:
Data RAM Pointers.
bank is addressed by one of three data RAM address point-
ers:
Example: Pn:b, where
26
0Ð255 (0000HÐ00FFH) for RAM0
256Ð511 (0100HÐ01FFH) for RAM1
n = pointer number = 0, 1, or 2
b = bank = 0 or 1,
thus,
P0:0, P1:0, P2:0 for RAM0
P0:1, P1:1, P2:1 for RAM1
Programs of up to 8K words can be
All Z893x3 family members feature
In register indirect, each data RAM
On-Chip Memory
Data Memory
Not Used
DRAM1
DRAM0
Figure 18. Memory Map
FFFF
0100
0000
512 words
01FF
00FF
In auto-increment, loop-increment, and loop-decrement in-
direct addressing, the pointer is automatically modified.
The data RAM pointers, which may be read or written di-
rectly, are 8-bit registers connected to the lower byte of the
internal 16-bit DDATA Bus.
Program Memory Pointers.
data RAM bank can be used as pointers to locations in Pro-
gram Memory. These pointers provide an efficient way to
address coefficients. The programmer selects a pointer lo-
cation using two bits in the status register and two bits in
the operand. At any one time, there are eight usable pointers,
four per bank, and the four pointers are in consecutive lo-
cations.
Example: Dn:b, where
Program Memory
ISR0-ISR2 Vectors
On-Chip Memory
RESET Vector
Not Used
n = pointer number = 0, 1, 2, or 3
b = bank = 0 or 1,
thus,
D0:0, D1:0, D2:0, D3:0 for RAM0
D0:1, D1:1, D2:1, D3:1 for RAM1
If S3/S4 = 01 in the status register, then
D0:0/D1:0/D2:0/D3:0 refer to register locations
4/5/6/7 in data RAM Bank 0.
FFFF
FFFC
0000
8 KW
1FFF-D
1FFC
1FFB
Or
The first 16 locations of each
DS000202-DSP0599
ZiLOG