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| 型號(hào)： | 73S1217F-68MR/F/PE |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 111/140頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC SOC SMART CARD READER 68QFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | * |
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73S1217F Data Sheet
DS_1217F_002
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 72: 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.
72
Rev. 1.2
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