Z8927320VSG Zilog, Z8927320VSG Datasheet - Page 30

• Manufacturer Part Number: Z8927320VSG
• Description: DSP 20MHZ 16-BIT W/ A/D 44-PLCC
• Manufacturer: Zilog
• Series: Z892x3r
• Type: Fixed Pointr

Specifications of Z8927320VSG

• 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: Lead free / RoHS Compliant

BANK/EXT REGISTER ASSIGNMENTS (Continued)
Z89223/273/323/373
16-Bit Digital Signal Processors with A/D Converter
Interrupt Status/Bank Select RegisterÑEXT7
Following is a description of EXT7. It contains both a Bank
Select Field and Interrupt Status Bits.
Bank Select Field.
bank is selected as the current working bank.
Interrupt Status Bits.
which interrupts are pending. A “1” denotes interrupt pend-
ing, and a “0” denotes no interrupt. This ability to identify in-
terrupts is particularly useful in polled interrupt operation or
when servicing ISR2, which may come from several sources.
30
Ext 7 Reg
D15 D14 D13 D12 D11 D10 D9
The four LSBs of EXT7 denote which
These bits can be read to identify
D8
D7 D6
Figure 20. EXT7 Register
D5
D4
Note: Write “1” to a particular status bit to clear that bit. Before
D3 D2
exiting an interrupt service routine, the relevant interrupt
bit(s) should be cleared. To clear a bit efficiently:
• Load the value of EXT7 into a register or memory
• Then load that value back into EXT7
Performing these steps clear all of the interrupts that
were pending, but leave the Register Bank Select
unchanged.
location
D1 D0
Bank Select
Interrupt Status Bits
Reserved
0000 : Bank0
0001 : Bank1
1111 : Bank15
Bit 4 = A/D Finish Interrupt
Bit 5 = SPI Interrupt
Bit 6 = Timer0 Interrupt
Bit 7 = Timer1 Interrupt
Bit 8 = Timer2 Interrupt
Bit 9 = INT0 (H/W) Interrupt
Bit 10 = INT1 (H/W) Interrupt
Bit 11 = INT2 (H/W) Interrupt
:
:
DS000202-DSP0599
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