Freescale Semiconductor, Inc.
Pin Descriptions
2.11 VRH and VRL
These pins provide the reference voltages for the analog-to-digital
converter.
2.12 PG7/R/W
This pin provides two separate functions, depending on the operating
mode. In single chip and bootstrap modes, PG7/R/W acts as
input/output port G bit 7. Refer to Parallel Input/Output for further
information.
In expanded and test modes, PG7/R/W performs the read/write function.
PG7/R/W signals the direction of transfers on the external data bus. A
high on this pin indicates that a read cycle is in progress.
2.13 Port signals
In the 84-pin PLCC package, 62 pins are arranged into seven 8-bit ports:
A, B, C, E, F, G, and H, and one six-bit port (D). The lines of ports A, B,
C, D, F, G, and H are fully bidirectional; E is input only. Each of the
bidirectional ports serves a purpose other than I/O, depending on the
operating mode or peripheral function selected. Note that ports B, C, F,
and one bit of port G are available for I/O functions only in single chip
and bootstrap modes. Refer to Table 2-1 for details of the port signals’
functions in different operating modes.
NOTE: When using the information about port functions, do not confuse pin
function with the electrical state of the pin at reset. All general-purpose
I/O pins configured as inputs at reset are in a high-impedance state. Port
data registers reflect the functional state of the port at reset. The pin
function is mode dependent.
Technical Data
MC68HC11P2 — Rev 1.0
Pin Descriptions
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