UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 351

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

14.4.3 Dedicated baud rate generator
generates a serial clock for transmission/reception of UART60 and UART61.
(1) Configuration of baud rate generator
The dedicated baud rate generator consists of a source clock selector and an 8-bit programmable counter, and
Separate 8-bit counters are provided for transmission and reception.
• Base clock
• Transmission counter
• Reception counter
Remark n = 0, 1
The clock selected by bits 3 to 0 (TPS63n to TPS60n) of clock selection register 6n (CKSR6n) is supplied to
each module when bit 7 (POWER6n) of asynchronous serial interface operation mode register 6n (ASIM6n)
is 1. This clock is called the base clock and its frequency is called f
level when POWER6n = 0.
This counter stops operation, cleared to 0, when bit 7 (POWER6n) or bit 6 (TXE6n) of asynchronous serial
interface operation mode register 6n (ASIM6n) is 0.
It starts counting when POWER6n = 1 and TXE6n = 1.
The counter is cleared to 0 when the first data transmitted is written to transmit buffer register 6n (TXB6n).
If data are continuously transmitted, the counter is cleared to 0 again when one frame of data has been
completely transmitted. If there is no data to be transmitted next, the counter is not cleared to 0 and continues
counting until POWER6n or TXE6n is cleared to 0.
This counter stops operation, cleared to 0, when bit 7 (POWER6n) or bit 5 (RXE6n) of asynchronous serial
interface operation mode register 6n (ASIM6n) is 0.
It starts counting when the start bit has been detected.
The counter stops operation after one frame has been received, until the next start bit is detected.
CHAPTER 14 SERIAL INTERFACES UART60 AND UART61
User’s Manual U17554EJ4V0UD
XCLK6
. The base clock is fixed to low
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