MC68HC711PH8 Motorola, MC68HC711PH8 Datasheet - Page 107

• Manufacturer Part Number: MC68HC711PH8
• Description: High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit
• Manufacturer: Motorola

5.8
In addition to the subsystem described in the above paragraphs (SCI1), the MC68HC11PH8 has
another, similar, SCI module (SCI2). This system is identical to SCI1, with the following
exceptions:
5.8.1
The contents of this register determine the baud rate for SCI2. For details of the bits and the
corresponding baud rates, see Section 5.6.1. This register also controls the MI BUS clock rate
(see Section 6).
MC68HC11PH8
SCI2/MI baud high (S2BDH)
SCI2/MI baud low (S2BDL)
– SCI2 shares I/O with two port G pins:
– The SCI2 transmit and receive functions are enabled by TE2 and RE2
– SCI1 functions and data are handled by a register block at $0070–$0077.
– The SCI2 baud rate register is at address $0050/51.
– In addition to the SCI functions,SCI2 is also used for MI BUS, controlled by
respectively, in S2CR2.
The corresponding registers for SCI2 are at addresses $0050–$0057, as
described in the following sections.
bit 5 of S2CR1. Refer to Section 6 for full details of MI BUS operation.
SCI2
S2BDH, S2BDL — SCI2 baud rate control registers
SERIAL COMMUNICATIONS INTERFACE
Address
$0050 B2TST B2SPL B2RST S2B12 S2B11 S2B10 S2B9
$0051
S2B7
bit 7
PG0
PG1
Pin
S2B6
bit 6
Alternate
function
RXD2
TXD2
S2B5
bit 5
S2B4
bit 4
S2B3
bit 3
S2B2
bit 2
S2B1
bit 1
S2B8 0000 0000
S2B0 0000 0100
bit 0
MOTOROLA
on reset
State
TPG
5-15
5