Z8F011ASH020EG2156 ZiLOG, Z8F011ASH020EG2156 Datasheet - Page 75

• Manufacturer Part Number: Z8F011ASH020EG2156
• Description: 8-bit Microcontrollers - MCU 1K FLASH 256B RAM 16B NVDS
• Manufacturer: ZiLOG

Specifications of Z8F011ASH020EG2156

• Rohs: yes
• Core: eZ8
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 20 MHz
• Program Memory Size: 1 KB
• Data Ram Size: 256 B
• On-chip Adc: No
• Package / Case: SOIC-20
• Mounting Style: SMD/SMT
• Interface Type: UART
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 17
• Number Of Timers: 2
• Program Memory Type: Flash
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 2.7 V

PS025113-1212
Interrupt Control Register Definitions
Caution:
Software Interrupt Assertion
To avoid missing interrupts, use the coding style in Example 2 to clear bits in the Interrupt
Request 0 Register:
Example 2.
Program code can generate interrupts directly. Writing 1 to the correct bit in the interrupt
request register triggers an interrupt (assuming that interrupt is enabled). When the inter-
rupt request is acknowledged by the eZ8 CPU, the bit in the interrupt request register is
automatically cleared to 0.
Example 3.
To avoid missing interrupts, use the coding style in Example 4 to set bits in the Interrupt
Request registers:
Example 4.
The Interrupt Control registers enable individual interrupts, set interrupt priorities and
indicate interrupt requests for all of the interrupts other than the Watchdog Timer interrupt,
the primary oscillator fail trap and the Watchdog Oscillator fail trap interrupts.
Zilog recommends not using a coding style to generate software interrupts by setting bits
in the Interrupt Request registers. All incoming interrupts received between execution of
the first LDX command and the final LDX command are lost. See Example 3, which fol-
lows.
LDX r0, IRQ0
AND r0, MASK
LDX IRQ0, r0
ANDX IRQ0, MASK
LDX r0, IRQ0
OR r0, MASK
LDX IRQ0, r0
ORX IRQ0, MASK
A good coding style that avoids lost interrupt requests:
A poor coding style that can result in lost interrupt requests:
A good coding style that avoids lost interrupt requests:
Interrupt Control Register Definitions
Z8 Encore!
Product Specification
®
F0830 Series
57