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參數資料
型號: 73S1215F-EB-LITE
廠商: Maxim Integrated Products
文件頁數: 103/136頁
文件大小: 0K
描述: BOARD EVAL 73S1215F CBL/DOC/CD
產品培訓模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 1
系列: *
DS_1215F_003
73S1215F Data Sheet
Rev. 1.4
69
Keypad Scan Time Register (KSCAN): 0xD3
0x00
This register contains the values of scanning time and debouncing time.
Table 72: The KSCAN Register
MSB
LSB
DBTIME.5 DBTIME.4 DBTIME.3 DBTIME.2 DBTIME.1 DBTIME.0 SCTIME.1 SCTIME.0
Bit
Symbol
Function
KSCAN.7
DBTIME.5
De-bounce time in 4ms increments. 1 = 4ms de-bounce time, 0x3F =
252ms, 0x00 = 256ms. Key presses and key releases are de-bounced by
this amount of time.
KSCAN.6
DBTIME.4
KSCAN.5
DBTIME.3
KSCAN.4
DBTIME.2
KSCAN.3
DBTIME.1
KSCAN.2
DBTIME.0
KSCAN.1
SCTIME.1
Scan time in ms. 01 = 1ms, 02 = 2ms, 00 = 3ms, 00 = 4ms. Time between
checking each key during keypad scanning.
KSCAN.0
SCTIME.0
Keypad Control/Status Register (KSTAT): 0xD4
0x00
This register is used to control the hardware keypad scanning and detection capabilities, as well as the
keypad interrupt control and status.
Table 73: The KSTAT Register
MSB
LSB
KEYCLK HWSCEN KEYDET KYDTEN
Bit
Symbol
Function
KSTAT.7
KSTAT.6
KSTAT.5
KSTAT.4
KSTAT.3
KEYCLK
The current state of the keyboard clock can be read from this bit.
KSTAT.2
HWSCEN
Hardware Scan Enable – When set, the hardware will perform automatic
key scanning. When cleared, the firmware must perform the key scanning
manually (bypass mode).
KSTAT.1
KEYDET
Key Detect – When HWSCEN = 1 this bit is set causing an interrupt that
indicates a valid key press was detected and the key location can be read
from the Keypad Column and Row registers. When HWSCEN = 0, this bit
is an interrupt which indicates a falling edge on any Row input if all Row
inputs had been high previously (note: multiple Key Detect interrupts may
occur in this case due to the keypad switch bouncing). In all cases, this bit
is cleared when read. When HWSCEN = 0 and the keypad interface 1kHz
clock is disabled, a key press will still set this bit and cause an interrupt.
KSTAT.0
KYDTEN
Key Detect Enable – When set, the KEYDET bit can cause an interrupt and
when cleared the KEYDET cannot cause an interrupt. KEYDET can still
get set even if the interrupt is not enabled.
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