diff options
Diffstat (limited to 'Documentation/i2c/chips/pcf8574')
| -rw-r--r-- | Documentation/i2c/chips/pcf8574 | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/Documentation/i2c/chips/pcf8574 b/Documentation/i2c/chips/pcf8574 index 2752c8ce3167..5c1ad1376b62 100644 --- a/Documentation/i2c/chips/pcf8574 +++ b/Documentation/i2c/chips/pcf8574 | |||
| @@ -62,8 +62,6 @@ if the corresponding output is set as 1, otherwise the current output | |||
| 62 | value, that is to say 0. | 62 | value, that is to say 0. |
| 63 | 63 | ||
| 64 | The write file is read/write. Writing a value outputs it on the I/O | 64 | The write file is read/write. Writing a value outputs it on the I/O |
| 65 | port. Reading returns the last written value. | 65 | port. Reading returns the last written value. As it is not possible |
| 66 | 66 | to read this value from the chip, you need to write at least once to | |
| 67 | On module initialization the chip is configured as eight inputs (all | 67 | this file before you can read back from it. |
| 68 | outputs to 1), so you can connect any circuit to the PCF8574(A) without | ||
| 69 | being afraid of short-circuit. | ||