Intel 8XC251SA Hardware Description

11
8xC251Tx Hardware Description
3.2.6 IE1
Address: B1H
Reset Value: xxxx xxx0B
3.2.7 IPH1
Address: B3H
Reset Value: xxxx xxx0B
3.2.8 IPL1
Address: B2H
Reset Value: xxxx xxx0B
Interrupt priority of the second serial I/O port can be programmed to one of four levels depending on the
IPH1.0 and IPL1.0 bits.
Table 8. IE1 Special Function Register Definitions
Bit Number
Bit Mne-
monic
Function
7 - 1 - Reserved
0 ES1 Second serial I/O port Interrupt Enable:
Setting this bit enables the second serial I/O port interrupt
Table 9. IPH1 Special Function Register Definitions
Bit Number
Bit Mne-
monic
Function
7 - 1 - Reserved
0 IPH1.0 Second serial I/O port Interrupt Priority High Bit
Table 10. IPL1 Special Function Register Definitions
Bit Number
Bit Mne-
monic
Function
7 - 1 - Reserved
0 IPL1.0 Second serial I/O port Interrupt Priority Low Bit
Table 11. Interrupt Priority of Second Serial I/O Port
IPH1.0 IPL1.0 Priority Level
0 0 0 (Lowest Priority)
0 1 1
1 0 2
1 1 3 (Highest Priority)

Intel 8XC251SA Specifications

General

Brand	Intel
Model	8XC251SA
Category	Microcontrollers
Language	English