Oki MSM66591, User Manual

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14-1
14
MSM66591/ML66592 User's Manual
Chapter 14 Baud Rate Generator Functions
Figure 14-1 Configuration of S0TM, S1TM, S2TM, S3TM, S4TM
14. Baud Rate Generator Functions
The MSM66591/ML66592 have five serial communication functions: the UART serial
ports 0, 2, 3, 4 and the synchronous/UART serial port 1. Each serial port has 8-bit
timers (S0TM, S1TM, S2TM, S3TM, S4TM) that can be used as baud rate generators.
When not used as baud rate generators, these timers can be used as 8-bit auto reload
timers.
The basic configuration of S0TM, S1TM, S2TM, S3TM and S4TM is the same, except
for the address of registers located in the SFR area.
Interrupts for S0TM, S1TM, S2TM, S3TM and S4TM are assigned to the same interrupt
vector. The generation of individual interrupt requests are enabled or disabled by bit 3
(ESTMn) of each timer control register (SnCON). Verification of whether an interrupt
request has been generated is performed based on bit 2 (QSTMn) of each timer control
register. (n = 0–4)
Figure 14-1 shows the configuration of S0TM, S1TM, S2TM, S3TM and S4TM. Table
14-1 lists the S0TM, S1TM, S2TM, S3TM and S4TM control SFRs.
Master clock (CLK)
1/2 CLK
1/2 TBCCLK
1/4 TBCCLK
1/8 TBCCLK
1/16 TBCCLK
1/64 TBCCLK
1/256 TBCCLK
Selector
SCIn Timer Counter
SCIn Timer Register
Interrupt
request
SnCON
OVF
Baud rate clock for
SCIn
(n = 0–4)
QSTMn ESTMn