Kawasaki 80C51, KS152JB, 80C152 Timer 1 generated commonly used Baud rates, Smod, Mhz

KS152JB Universal Communications Controller Technical Specifications

in auto-reload mode. In such a case the baud rate is given by

Mode 1,3 baud rate = 2(SMOD - 5) X Oscillator Frequency / (12 x [256 - TH1])

It is also possible to achieve very low baud rates by putting Timer 1 in Mode1 as a 16 bit timer and enabling its interrupt. The Timer interrupt is used to reload the Timer 1 with a 16 bit value using software methods. A list of commonly used baud rates and how they can be achieved is shown in table 4

Table 7: Timer 1 generated commonly used Baud rates

Baud Rate	fosc	SMOD	C/T	Mode	Reload
					Value
Mode 0 Max 1 MHZ	12 MHZ	X	X	X	X
Mode 2 Max 375K	12 MHZ	1	X	X	X
Modes 1,3 62.5K	12 MHZ	1	0	2	FFh
19.2 K	11.059 MHZ	1	0	2	FDh
9.6 K	11.059 MHZ	0	0	2	FDh
4.8 K	11.059 MHZ	0	0	2	FAh
2.4 K	11.059 MHZ	0	0	2	F4h
1.2 K	11.059 MHZ	0	0	2	E8h
137.5	11.059 MHZ	0	0	2	1Dh
110	6 MHZ	0	0	2	72h
110	12 MHZ	0	0	2	FEEBh

Kawasaki LSI USA, Inc. Page 29 of 120 Ver. 0.9 KS152JB2