DM-COP8/28D National Semiconductor, DM-COP8/28D Datasheet - Page 69

• Manufacturer Part Number: DM-COP8/28D
• Description: CABLE FOR DEBUG MODULE 28-DIP
• Manufacturer: National Semiconductor

Specifications of DM-COP8/28D

• Accessory Type: 28-DIP Target Cable
• For Use With/related Products: MetaLink Debug Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *DM-COP8/28D

The Multi-Input Wakeup feature is used to return (wakeup) the device from either the
HALT or IDLE modes. Alternately Multi-Input Wakeup/Interrupt feature may also be
used to generate up to 8 edge selectable external interrupts.
Figure 2-20 shows the Multi-Input Wakeup logic.
Multi-Input Wakeup (MIWU) enables designers to specify whichever of the controller’s 8
pins they want to be used to “wake up” the device to process instructions. This capability
is activated during a transition on the input pin — from low to high, or high to low —
which is recorded internally in the chip’s registers. Without multi-input wakeup, the
microcontroller would be required to keep its software and code running constantly
(Figure 2-21).
L0
L7
0 = low going high
1 = high going low
WKEDG
Figure 2-20 Multi-Input Wake Up Logic
WKPND
7
0
7
INTERNAL DATA BUS
ICNTRL REG
LPEN BIT IN
............................
WKEN
COP8SAx7 MICROCONTROLLER
T0 INTERRUPT LOGIC
0
IDLE
R
S
Q
Q
R
STOP
R
HALT
TIMER
IDLE
S
CHIP CLOCK
Q
S
Q
CKI CK0
OSC
CKT
2-31