Sentinel65X-Handbook/Clock Port.md

Table of Contents

• Clock Port
• Pinout

Clock Port

The Sentinel 65X clock port is a small, 28-pin female pin header on the mainboard, which exposes the system's debug serial line, I2C bus, reset and main interrupt lines, PHI2 clock signal, and a 64-address memory-mapped I/O region, mapped to memory beginning at 0x00DFC0. This region of uncommitted expansion is reserved for the use of user-installed clock port accessories.

The clock port's pin header has two rows, and a pin and row pitch of 2.54mm.

Pinout

The clock port's pinout, as seen from above, is shown in the following table:

Pin	Label		Label	Pin
1	GND		+3.3V	2
3	TXD		SCL	4
5	RXD		SDA	6
7	/CTS		/RES	8
9	/RTS		/IRQ	10
11	PHI2		/CS1	12
13	/RD		/WR	14
15	A5		A4	16
17	A3		A2	18
19	A1		A0	20
21	D7		D6	22
23	D5		D4	24
25	D3		D2	26
27	D1		D0	28