C8051F124-GQR Datasheet, PDF (342/350 Pages) Silicon Laboratories – Mixed Signal ISP Flash MCU Family

C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
25.1. Boundary Scan
The DR in the Boundary Scan path is an 134-bit shift register. The Boundary DR provides control and
observability of all the device pins as well as the SFR bus and Weak Pullup feature via the EXTEST and
SAMPLE commands.
Table 25.1. Boundary Data Register Bit Definitions
EXTEST provides access to both capture and update actions, while Sample only performs a capture.
Bit
Action Target
0
Capture Reset Enable from MCU (64-pin TQFP devices)
Update _{Reset Enable to RST pin (64-pin TQFP devices)}
1
Capture _{Reset input from RST pin (64-pin TQFP devices)}
Update _{Reset output to RST pin (64-pin TQFP devices)}
2
Capture _{Reset Enable from MCU (100-pin TQFP devices)}
Update _{Reset Enable to RST pin (100-pin TQFP devices)}
3
Capture _{Reset input from RST pin (100-pin TQFP devices)}
Update _{Reset output to RST pin (100-pin TQFP devices)}
4
Capture External Clock from XTAL1 pin
Update Not used
5
Capture Weak pullup enable from MCU
Update Weak pullup enable to Port Pins
6, 8, 10, 12, 14, Capture P0.n output enable from MCU (e.g. Bit6=P0.0, Bit8=P0.1, etc.)
16, 18, 20
Update P0.n output enable to pin (e.g. Bit6=P0.0oe, Bit8=P0.1oe, etc.)
7, 9, 11, 13, 15, Capture P0.n input from pin (e.g. Bit7=P0.0, Bit9=P0.1, etc.)
17, 19, 21
Update P0.n output to pin (e.g. Bit7=P0.0, Bit9=P0.1, etc.)
22, 24, 26, 28, 30, Capture P1.n output enable from MCU
32, 34, 36
Update P1.n output enable to pin
23, 25, 27, 29, 31, Capture P1.n input from pin
33, 35, 37
Update P1.n output to pin
38, 40, 42, 44, 46, Capture P2.n output enable from MCU
48, 50, 52
Update P2.n output enable to pin
39, 41, 43, 45, 47, Capture P2.n input from pin
49, 51, 53
Update P2.n output to pin
54, 56, 58, 60, 62, Capture P3.n output enable from MCU
64, 66, 68
Update P3.n output enable to pin
55, 57, 59, 61, 63, Capture P3.n input from pin
65, 67, 69
Update P3.n output to pin
70, 72, 74, 76, 78, Capture P4.n output enable from MCU
80, 82, 84
Update P4.n output enable to pin
71, 73, 75, 77, 79, Capture P4.n input from pin
81, 83, 85
Update P4.n output to pin
86, 88, 90, 92, 94, Capture P5.n output enable from MCU
96, 98, 100 _{Update P5.n output enable to pin}
87, 89, 91, 93, 95, Capture P5.n input from pin
97, 99, 101 Update P5.n output to pin
102, 104, 106, Capture P6.n output enable from MCU
108, 110, 112, 114, _{Update P6.n output enable to pin}
116
342
Rev. 1.4