73S1210F Datasheet, PDF (38/126 Pages) Teridian Semiconductor Corporation – Self-Contained Smart Card Reader with PINpad and Power Management

73S1210F Data Sheet
DS_1210F_001
Enable Bit
EX0
EX1
EX2
EX3
EX4
EX5
EX6
Table 26: Control Bits for External Interrupts
Description
Enable external interrupt 0
Enable external interrupt 1
Enable external interrupt 2
Enable external interrupt 3
Enable external interrupt 4
Enable external interrupt 5
Enable external interrupt 6
Flag Bit
IE0
IE1
IEX2
IEX3
IEX4
IEX5
IEX6
Description
External interrupt 0 flag
External interrupt 1 flag
External interrupt 2 flag
External interrupt 3 flag
External interrupt 4 flag
External interrupt 5 flag
External interrupt 6 flag
1.7.5.4 Power Down Interrupt Logic
The 73S1210F contains special interrupt logic to allow INT0 to wake up the CPU from a power down
(CPU STOP) state. See the Power Control Modes section for details.
1.7.5.5 Interrupt Priority Level Structure
All interrupt sources are combined in groups, as shown in Table 27.
Group
0
1
2
3
4
5
Table 27: Priority Level Groups
External interrupt 0
Timer 0 interrupt
External interrupt 1
Timer 1 interrupt
Serial channel 0 interrupt
–
Serial channel 1 interrupt
–
–
–
–
–
External interrupt 2
External interrupt 3
External interrupt 4
External interrupt 5
External interrupt 6
Each group of interrupt sources can be programmed individually to one of four priority levels by setting or
clearing one bit in the special function register IP0 and one in IP1. If requests of the same priority level
are received simultaneously, an internal polling sequence as per Table 31 determines which request is
serviced first.
IEN enable bits must be set to permit any of these interrupts to occur. Likewise, each interrupt has its
own flag bit that is set by the interrupt hardware and is reset automatically by the MPU interrupt handler.
Interrupt Priority 0 Register (IP0): 0xA9  0x00
MSB
–
Table 28: The IP0 Register
WDTS IP0.5 IP0.4 IP0.3 IP0.2
IP0.1
LSB
IP0.0
Note: WDTS is not used for interrupt controls.
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Rev. 1.4