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14
MSM66591/ML66592 User's Manual
Chapter 14 Baud Rate Generator Functions
14.1 Configuration of SCI0 Timer (S0TM)
The SCI0 timer (S0TM) consists of an 8-bit SCI0 timer counter, an 8-bit SCI0 timer
register that stores the reload values of the SCI0 timer counter, and a control register
(S0CON) that specifies the timer counter operations.
[1]
SCI0 Timer Counter (low-order 8 bits of 16-bit register S0TM)
The SCI0 timer counter is an 8-bit counter. When S0TM overflows, an interrupt request
is generated, and the content of the 8-bit SCI0 timer register is loaded to SCI0 timer
counter. The count clock of S0TM is selected by the high-order 3 bits (bits 5–7) of the
8-bit SCI0 timer control register (S0CON).
[2]
SCI0 Timer Register (high-order 8 bits of 16-bit register S0TM)
The SCI0 timer register is an 8-bit register. The content of the register is loaded to the
SCI0 timer counter when the counter overflows.
The SCI0 timer counter and SCI0 timer register are accessible only as a 16-bit S0TM
which uses the SCI0 timer counter as its low-order 8 bits and the SCI0 timer register as
its high-order 8 bits.
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), S0TM becomes 0000H, and
the count operation stops.
[3]
SCI0 Timer Control Register (S0CON)
S0CON is an 8-bit register. The high-order 4 bits (bits 4–7) select the count clock of
S0TM, and controls the start/stop of the count operation. The low-order 2 bits (bits 2
and 3) perform interrupt related controls. The least significant bit (bit 0) specifies the
mode of S0TM.
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), S0CON becomes 02H, a
CLK is selected as the count clock of S0TM, the auto reload timer mode is selected,
and operation stops.
Figure 14-2 shows the configuration of S0CON.
<Description of Each Bit>
• S0MOD (bit 0)
This bit specifies the operation mode of S0TM. If this bit is "0", S0TM operates in
auto reload timer mode. If "1", S0TM operates in SCI0 baud rate generator mode.
• QSTM0 (bit 2)
This bit becomes "1" if an SCI0 timer counter overflow is generated. Since this bit
does not become "0" automatically after an interrupt process is executed, it is
necessary to set to "0" by the program.
• ESTM0 (bit 3)
This bit enables/disables an interrupt request generation by an SCI0 timer counter
overflow. If this bit is "1", generation is enabled, and if "0", generation is disabled.
Содержание MSM66591
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