ZLF645S2864GP0001 Maxim Integrated, ZLF645S2864GP0001 Datasheet - Page 138

• Manufacturer Part Number: ZLF645S2864GP0001
• Description: 8-bit Microcontrollers - MCU Crimzon Flash Infrared MCU
• Manufacturer: Maxim Integrated

Specifications of ZLF645S2864GP0001

• Core: Z8
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 8 MHz
• Program Memory Size: 64 KB
• Data Ram Size: 1 KB
• Operating Supply Voltage: 2 V to 3.6 V
• Interface Type: UART
• Number Of Programmable I/os: 5
• Number Of Timers: 2 x 8 bit, 1 x 16 bit
• Processor Series: ZLF645
• Program Memory Type: Flash

Table 63. Interrupt Priority Register (IPR)
19-4572; Rev 0; 4/09
Bit
Field
Reset
R/W
Address
Bit Position
[7:6] 
[5] 
Interrupt Priority Register
Reserved
X
7
Programming bits for the Interrupt Edge Select are located in the IRQ register (R250), 
bit 6 and bit 7.
Table 62. Interrupt Request Register
The Interrupt Priority register (see
priority. Interrupts are divided into three groups of two—Group A, Group B, and Group C.
IPR bits 4, 3, and 0 determine which interrupt group has priority. For example, if interrupts
IRQ5, IRQ1, and IRQ0 occur simultaneously when IPR[4:3,0]=001b, the interrupts are
serviced in the following order: IRQ1, IRQ0, IRQ5.
IPR bits 5, 2, and 1 determine which interrupt within each group has higher priority.
Value
IRQ Bit
7
0
0
1
1
Note: F = Falling Edge; R = Rising Edge.
—
0
1
—
X
6
Description
Reserved
Reads are undefined; writes must be 00b.
Group A Priority (IRQ3, IRQ5)
IRQ5 > IRQ3
IRQ3 > IRQ5
6
0
1
0
1
Group A
Priority
Table 62
W
X
5
Interrupt Edge
IRQ2 (P31)
F
F
R
R/F
Bank Independent: F9h; Linear: 0F9h
provides the configuration.
Group Priority
X
4
[2:1]
W
Table
IRQ0 (P32)
F
R
F
R/F
X
3
63) defines which interrupt holds the highest 
Group B
Priority
W
X
2
ZLF645 Series Flash MCUs
Group C
Priority
W
X
1
Product Specification
Interrupt Priority Register
Group Priority
[0]
W
X
0
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