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MSM66591/ML66592 User's Manual
Chapter 15 Serial Port Functions
[2]
SCI3 Receive Control Register (SR3CON)
SR3CON is a 5-bit register that controls SCI3 receive operations.
At reset (when the
RES
signal is input, the BRK instruction is executed, the watchdog
timer is overflown, or an operation code trap is generated), SR3CON becomes 12H, the
SCI3 operation is in UART normal, single buffer mode, at 8-bit data length, no parity,
and receive is disabled.
When changing the contents of SR3CON, do so after resetting SR3REN (bit 7) to "0". If
the SR3CON is changed before resetting SR3REN (bit 7) to "0", the current and future
receive is not normally performed.
Figure 15-19 shows the configuration of SR3CON.
<Description of Each Bit>
• SR3MD (bit 0)
This bit specifies the receive operation mode of SCI3.
• SR3MPC (bit 2)
If SCI3 receives in UART multiprocessor communication mode, this bit specifies
which is received, data or an address. The receive data length is 8 bits. If this bit is
"0", data is received, and if "1", an address is received.
• SR3EXP (bit 3)
This bit specifies the SCI3 receive buffer mode. If this bit is "0", only S3BUF0 is
enabled as a receive buffer (single buffer mode), and if "1", S3BUF0, S3BUF1,
S3BUF2, and S3BUF3 are enabled as a receive buffer (4-stage buffer mode).
During the 4-stage buffer mode, the receive buffers operate as a ring buffer.
• SR3PEN (bit 5)
This bit specifies whether a parity bit is included when SCI3 receives. If this bit is "0",
SCI3 receives without a parity bit, and if "1", SCI3 receives with a parity bit.
• SR3EVN (bit 6)
This bit specifies the logic of the parity bit when SCI3 receives. If this bit is "0", SCI3
receives at odd parity, and if "1", SCI3 receives at even parity.
• SR3REN (bit 7)
This bit specifies enable/disable of SCI3 receive. If this bit is "0", SCI3 receive is
disabled, and if "1", SCI3 receive is enabled.
Содержание MSM66591
Страница 1: ...MSM66591 ML66592 User s Manual CMOS 16 bit microcontroller FEUL66591 66592 01 Issue Date Mar 4 2002...
Страница 15: ...Contents 12...
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Страница 18: ...Overview Chapter 1 1...
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Страница 30: ...Description of Pins Chapter 2 2...
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Страница 44: ...CPU Architecture Chapter 3 3...
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Страница 101: ...3 56 MSM66591 ML66592User sManual Chapter 3 CPU Architecture...
Страница 102: ...CPU Control Functions Chapter 4 4...
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Страница 112: ...Memory Control Functions Chapter 5 5...
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Страница 117: ...5 4 MSM66591 ML66592User sManual Chapter 5 Memory Control Functions...
Страница 118: ...Port Functions Chapter 6 6...
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Страница 152: ...Output Pin Control Pin OE Chapter 7 7...
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Страница 156: ...Clock Generation Circuit Chapter 8 8...
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