MC68HC711PH8 Motorola, MC68HC711PH8 Datasheet - Page 99

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MC68HC711PH8

Manufacturer Part Number
MC68HC711PH8
Description
High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit
Manufacturer
Motorola
Datasheet
5.6.2
The SCCR1 register provides the control bits that determine word length and select the method
used for the wake-up feature.
LOOPS — SCI loop mode enable
Both the transmitter and receiver must be enabled to use the LOOP mode. When the LOOP mode
is enabled, the TXD pin is driven high (idle line state) if the transmitter is enabled.
WOMS — Wired-OR mode for SCI pins (PD1, PD0)
Bit 5 — Not implemented; always reads zero
MC68HC11PH8
SCI1 control 1 (SCCR1)
1 (set)
0 (clear) –
1 (set)
0 (clear) –
SCCR1 — SCI control register 1
Target
19200
38400
baud
1200
2400
4800
9600
rate
110
150
300
600
SCI transmit and receive are disconnected from TXD and RXD pins,
and transmitter output is fed back into the receiver input.
SCI transmit and receive operate normally.
TXD and RXD are open drains if operating as outputs.
TXD and RXD operate normally.
Table 5-1 Example SCI baud rate control values
Dec value Hex value Dec value Hex value Dec value Hex value
SERIAL COMMUNICATIONS INTERFACE
2272
1666
833
416
208
104
Address
52
26
13
$0072 LOOPS WOMS
8 MHz
$08E0
$01A0
$00D0
$001A
$000D
$0682
$0341
$0068
$0034
bit 7
bit 6
ST4XCK frequency
2500
1250
3409
625
312
156
78
39
20
12 MHz
bit 5
0
$0D51
$09C4
$04E2
$009C
$004E
$0271
$0138
$0027
$0014
bit 4
M
WAKE
bit 3
4545
3333
1666
833
416
208
104
52
26
13
16 MHz
bit 2
ILT
$11C1
$0D05
$00D0
$000D
$0682
$0341
$01A0
$0068
$0034
$001A
bit 1
PE
bit 0
PT
MOTOROLA
0000 0000
on reset
State
TPG
5-7
5

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