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參數(shù)資料
| 型號： | EM6617VVVST11A |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 0.032768 MHz, RISC MICROCONTROLLER |
| 封裝： | STICKY TAPE |
| 文件頁數(shù)： | 14/66頁 |
| 文件大小： | 759K |
| 代理商： | EM6617VVVST11A |
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EM6617-1
EM Microelectronic-Marin SA , 3/99 Rev. B/258
14
7.2 Port A
The EM6617-1 has one four bit general purpose CMOS input port. The port A input can be read at any time,
internal pull-up or pull-down resistors can be chosen. All selections concerning port A are bit-wise executable.
I.e. Pull-up on PA[2], pull-down on PA[0], positive IRQ edge on PA[0] but negative on PA[1], etc.
In sleep mode the port A pull-up or pull-down resistors are turned off, and the inputs are deactivated except if
the
InpResSleep
bit in the option register
OPTFSelPB
is set to 1. In this case the port A inputs are continuously
monitored to match the input reset condition which will immediately wake the EM6617-1 from sleep mode (all
pull resistors remain).
Figure 12. Input Port A Configuration
IntEdgPA[n]=0
NoDebIntPA[n]=1
Mask opt
MPAPU[n]
IRQPA[3:0]
PA[n]terminal
PA0, PA3
for 10-Bit
Counter
Mask opt
MPAPD[n]
Debouncer
μP TestVar
Ck[8] Ck[11] or
Ck[14]
DB[3:0]
NoPullPA[n]
Vbat
(V
DD
)
V
SS
Input Reset allowed
when in Sleep
Sleep
7.2.1 IRQ on Port A
For interrupt request generation (IRQ) one can choose direct or debouncer input and positive or negative edge
IRQ triggering. With the debouncer selected (
OPTDebIntPA
) the input must be stable for two rising edges of
the selected debouncer clock (
RegPresc
). This means a worst case of 16 ms (default) or 2 ms (0.25 ms by
metal mask) with a system clock of 32 KHz.
Either a positive or a negative edge on the port A inputs - after debouncer or not - can generate an interrupt
request. This selection is done in the option register
OPTIntEdgPA.
All four bits of port A can provide an IRQ, each pin with its own interrupt mask bit in the
RegIRQMask1
register.
When an IRQ occurs, inspection of the
RegIRQ1
,
RegIRQ2
and
RegIRQ3
registers allows the interrupt to be
identified and treated.
At power on or after any reset the
RegIRQMask1
is set to 0, thus disabling any input interrupt. A new interrupt is
only stored with the next active edge after the corresponding interrupt mask is cleared. See also the interrupt
chapter 13.
It is recommended to mask the port A IRQ’s while one changes the selected IRQ edge. Else one may generate
a IRQ (Software IRQ). I.e. PA[0] on ‘0’ then changing from positive to negative edge selection on PA[0] will
immediately trigger an IRQPA[0] if the IRQ was not masked.
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